How to Make Your Bath / Shower Surround Grout Look New Again!

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  • Опубликовано: 27 июн 2014
  • repairs101.ca/how-to-make-you...
    You won't believe the difference in the before and after shots! How to do it yourself tutorial on replacing existing grout without re-tiling the wall. Shows tools, tips and tricks of the trade. So easy, almost anyone can do it. #bathrooms #grout #handyman
    Transcript provided for the hearing impaired:
    Alright so today on Repairs101 I'm going to show you how I was able to brighten up this dingy looking shower surround in only a few hours a day over a period of a few days.
    You know the first time I did this I was twenty years old and I had nothing but a simple putty knife and an old box cutter to work with. And you know what? It still turned out really good. So it's an easy job as far as equipment and skills go but if you're not used to doing manual labour you may find this to be a daunting task.
    I ended up going with this ready-mix stuff.
    Really the first thing I did was repaint the bathroom. Put in the plug and use a drop sheet -- there's going to be a lot of dust that you do not want in your pipes.
    Start by pulling back the old silicone. Then use a grout rake to remove a layer of grout throughout.
    Do everything you can to remove the dust without getting the grout wet -- otherwise you're going to have to wait another day for it to dry out.
    You'll find that diagonal strokes generally work the best, but not always.
    You'll have to wait about half an hour for the mud to set up before you can start sponging it clean.
    A plastic scraper is ideal for removing excess grout from the tile surfaces before wiping everything down with a sponge for a smooth, even surface.
    Now if you can't wait seventy-two hours for it to cure before you have a shower you can hang plastic over the tile like this to protect the grout but you have to take it down right after your shower in order to allow the air to get at it.
    Now this last step is by far the most tedious. Have your plastic scraper handy for the little chunks and bits that you'll find are still clinging to the tiles' surface. Polish the haze off each tile individually using your clean, cotton rags.
    Make sure that your caulking is for bath and tile and smooth it out with a gloved finger dipped in paint thinner.
    Alright, thanks for watching -- and don't forget to subscribe!
  • ХоббиХобби

Комментарии • 474

  • @chrismac4441
    @chrismac4441 2 года назад +45

    Great how-to. Short and straight to the point. All killer, no filler. Saved the video for when I'm ready to tackle this bathroom. Thanks and hi from Scotland

  • @iviaverick52
    @iviaverick52 Год назад +22

    This is super helpful if you happen to buy a house where the previous owner DIY'd a shower install and definitely didn't do the best job on the grout *raises hand*

  • @delailak6754
    @delailak6754 2 года назад +6

    It's 7 years ago but a very good reference for home diy in 2021. Superb!

    • @repairs101
      @repairs101  2 года назад +1

      Glad you liked it! Best part is - seven years later and my grout still looks fantastic!!

  • @theonlyjfaz
    @theonlyjfaz 4 года назад +53

    You can cut the time in half if u have a multimaster tool. I bought a 1/4 grout grinding blade and used a vacuum to removed the dust. Way less prep and way easier to clean.

    • @samanthasmile7746
      @samanthasmile7746 Год назад +1

      Multi master tool? Where do I get one?

    • @pete3425
      @pete3425 Месяц назад

      It’s a tool that multiple people use to masturbate with at once.

  • @melbendigo
    @melbendigo 3 года назад +1

    The best instructions for re-grouting I've found! Thank you!

  • @mdavid7149
    @mdavid7149 3 года назад

    Now I am grout thanks to this video. Real. Simple. Straightforward. Thank you Sir

  • @LMCFalcon12
    @LMCFalcon12 Год назад +2

    Holy cow. I've had to fix grout several times. You taught me a lot of great stuff! Glad I saw this before I started working on it this week.

  • @jackiepearson2779
    @jackiepearson2779 5 лет назад +16

    I know the way you did it is SUPPOSSED to work. It wears me out just watching you do such a remarkably good job. I'll have to call someone. Good job!

  • @tracymarkovic6554
    @tracymarkovic6554 7 лет назад +75

    installing new grout is best done to moist grout so that there is a chemical bond that takes place. This is called rooting. Depending on the grout you use (some set up much faster) you must sponge tool the grout much sooner than 30 minutes or your looking at a real tough job of tooling and removing excess especially on textured tile or natural stone. . Scraping off exces? there should not be any excess only a film haze on the tile to be removed using a dry towel to buff off.

  • @memeagain4106
    @memeagain4106 5 лет назад +167

    use the edge of a credit card cut at a angle for the silicone bit, if you use your finger it leaves a curve in the silicon where the water can sit and cause mildew, the straight edge of a credit card makes the silicone into a flat triangle type of shape so the water just drips off

    • @repairs101
      @repairs101  5 лет назад +12

      Great tip thanks!

    • @michaelalgarra3864
      @michaelalgarra3864 5 лет назад +7

      i cringed at his caulking, if you cut the tip the right way you can press it in as you go

    • @beautiful_bags
      @beautiful_bags 5 лет назад +13

      hi, ive been told that you dont grout the bottom of the shower where the walls meet the floor
      because this is a cracking point, it just needs to be siliconed,,,,,, is this also true for the tiles that meet in the corners "vertically"??, thanks in advance

    • @Ibarakify
      @Ibarakify 4 года назад +20

      You only leave a curve if you didn't use enough silicone. If you cut your tip at a proper angle, you'll fill any void space and, when pressing your finger, create a smooth soft-triangle that water runs off of.
      Cards or tools leave far more imperfections and have much greater failure rates for mildew/mold due to worn out rubber/imperfections. There is never any subtitute for your finger (don't use a glove either as this can cause bunching/imperfections in the silicone).

    • @ADSRUKDNB
      @ADSRUKDNB 4 года назад +1

      Use a piece of timber (a sharp 6mm wide tip) and a washing up liquid in water spray to point the silicone at a 45 degree angle for best results

  • @Andy-wr7rm
    @Andy-wr7rm 5 лет назад +216

    It would be easier if you sponge the grout before if goes hard then you wont have to scrape if off the tiles

    • @kallenyc
      @kallenyc 2 года назад +18

      I can't believe this video has so many views when the basics of grouting are done wrong! Smh.... You ALWAYS clean the excess grout off before you allow it to dry!

    • @peteryeung111
      @peteryeung111 Год назад +5

      @@kallenyc
      It’s absolutely horrendous 😲

  • @MsNess87
    @MsNess87 3 года назад

    So satisfying to watch

  • @monaLisa-it3cc
    @monaLisa-it3cc 9 месяцев назад +2

    Thank you for your video and useful information.
    Greetings from Poland 🇵🇱

    • @repairs101
      @repairs101  8 месяцев назад

      Glad it was helpful!

  • @GenerationZeroFNIX
    @GenerationZeroFNIX 11 месяцев назад

    Amazing! You answered all the questions I had as I'm watching. Thank you👍

    • @repairs101
      @repairs101  11 месяцев назад

      Glad it was helpful!

  • @olgacotto7915
    @olgacotto7915 2 месяца назад

    Very straight foward instructions and I learned something new. Thank you!

  • @belsamsou
    @belsamsou 3 года назад

    Amazing clean job 👍👍👍👍

  • @maylightbewithyou
    @maylightbewithyou 4 года назад +1

    Thanks for all the info!

  • @katemoore8640
    @katemoore8640 5 лет назад +2

    Excellent - thank you!

  • @user-dl3ll5cx1l
    @user-dl3ll5cx1l 4 месяца назад +1

    2.3 million views very impressive, and an excellent video. Thank you.

    • @repairs101
      @repairs101  4 месяца назад +1

      Thank you for the positive feedback!

    • @user-dl3ll5cx1l
      @user-dl3ll5cx1l 4 месяца назад

      @@repairs101 you're most welcome and thanks for bring your best to our world.

  • @anthonylau3065
    @anthonylau3065 7 лет назад +23

    I love the tip about about hanging plastic sheets so you can continue using the shower.

    • @repairs101
      @repairs101  7 лет назад +1

      Make sure you take them down after your shower or your grout will never dry.

    • @anthonylau3065
      @anthonylau3065 7 лет назад +1

      Fer sure! A very important point for it to be a great job.

  • @shahilanathan8067
    @shahilanathan8067 2 года назад +1

    Great job...contemplating doing this to my 1990's beige shower. Don't want to tear down the bathtub.

    • @repairs101
      @repairs101  2 года назад +1

      Go for it! 7 years later mine still looks fantastic!

  • @moya7433
    @moya7433 7 лет назад +1

    you made my day!! Thank you for this video.

  • @afdave7
    @afdave7 3 года назад +4

    Man, this is great content. Thank you!!!!

  • @bilitisjane
    @bilitisjane 10 лет назад

    Sorry for the late but i don't come often on youtube this time... Work work work.... and heatwave !
    Thanks for this sharing and big thumbs up.
    (and sorry for my bad english)

    • @repairs101
      @repairs101  10 лет назад

      Thanks for taking the time! Keep cool!

  • @sharonnygren3445
    @sharonnygren3445 2 года назад

    Beautiful job!!

  • @The755411
    @The755411 4 года назад +1

    gonna do my mothers bathroom during this quarantine thanks a lot for the help !(:

    • @striker851
      @striker851 4 года назад

      Just refreshed my shower walls where old grout was chipping out. Quarantine has made me in to a handyman extraordinaire!

  • @levonvardanyan3478
    @levonvardanyan3478 3 года назад +2

    I use to struggle with caulking and could never do i nice clean line until someone showed me a trick. You put a line of caulking, then with finger smooth it out, and then with a moist rag light wipe the excess caulking away for a straight clean thin linr of caulking.

  • @LilMtn0011
    @LilMtn0011 2 года назад

    Very helpful and to the point. Appreciated.

  • @anthonyxuereb792
    @anthonyxuereb792 4 года назад

    Very thorough.

  • @pattybraithwaite2589
    @pattybraithwaite2589 Год назад

    Great job!

  • @Al-og3dc
    @Al-og3dc 9 месяцев назад

    Great video, you're very skilled.

    • @repairs101
      @repairs101  9 месяцев назад

      Thank you very much!

  • @PhilFeedback
    @PhilFeedback 6 лет назад +3

    Great job, thanks for posting this video

  • @aletaaguilar5416
    @aletaaguilar5416 2 года назад

    Thanks for the tips

  • @ericaspruill8461
    @ericaspruill8461 7 лет назад

    This looks much better!

  • @tonyburry9036
    @tonyburry9036 Год назад

    The longest grout process job I have ever seen!!

  • @allthetimeimfly
    @allthetimeimfly Год назад

    This was awesome, thanks!!

  • @HobTecCars
    @HobTecCars 9 месяцев назад

    Great video thanks very much, very helpful

    • @repairs101
      @repairs101  8 месяцев назад

      Glad it was helpful!

  • @AthenaProsperus
    @AthenaProsperus 2 года назад

    That’s so beautiful 😍

    • @repairs101
      @repairs101  2 года назад

      Now it's years later and it still looks just as good!

  • @bigmacdaddy1234
    @bigmacdaddy1234 4 года назад +9

    Use blue painters tape when putting caulking around the tub. Gives it a nice clean line.

    • @Kev-england80
      @Kev-england80 4 года назад

      Will do👍

    • @nallis01
      @nallis01 2 года назад

      That's exactly what I do ALL THE TIME. PERFECT CAULK LINES GUARANTEED!

  • @sweetiepienumber1
    @sweetiepienumber1 3 года назад

    Looks so much better. I use a rubber float to apply grout.

    • @repairs101
      @repairs101  3 года назад

      7 years later and my grout still looks perfect

  • @shellebellesvideos8403
    @shellebellesvideos8403 8 лет назад +22

    Nice work! It looks great! I am looking to do this in my bathroom! I've never done it before. I hope mine turns out as good as yours.

    • @repairs101
      @repairs101  8 лет назад +3

      +ShelleBelle's Videos - more than a year later and mine still looks great! Good luck!

    • @shellebellesvideos8403
      @shellebellesvideos8403 8 лет назад +6

      +Repairs101 Finished regrouting the tiles in the shower, and it looks great! It looks so good, I want to do all the tiles in the bathroom now!

    • @repairs101
      @repairs101  8 лет назад

      +ShelleBelle's Videos - Awesome! Thanks for letting me know!

    • @repairs101
      @repairs101  8 лет назад +2

      Politics? No thanks. I'm Canadian.

    • @repairs101
      @repairs101  8 лет назад +4

      OK ok so the thing is a huge percentage of Canadians themselves or their ancestors sought refuge here from poverty, oppression, persecution, war, genocide, slavery, famines and plagues. Its nothing new.

  • @moroccaninusa1796
    @moroccaninusa1796 9 месяцев назад

    Good job

  • @dejoriamckinney790
    @dejoriamckinney790 Год назад +2

    Can’t wait to do this to my bathroom this weekend and change my curtains n stuff cause it’s time and my damn landlord not doing it but it’s a self project I’m also interested in doing ❤

  • @j.schlasner8602
    @j.schlasner8602 4 года назад

    Looks fabulous on those ceramic tiles. What if you have stone, though. It's so porous. Will this method still work?

  • @analarson2920
    @analarson2920 4 года назад +3

    nice job, I hope to redo out bath floor. Keep sharing.

  • @glgoetting
    @glgoetting 4 года назад +8

    One of the best how to / quick videos I've seen - excellent work!
    ...only problem is you make it look too easy 🤣 ... respectively you acknowledge with labor hours... Just awesome 👍

  • @jreed1701d
    @jreed1701d 7 лет назад +23

    As a first time homeowner, this was really helpful. I could pay someone to do this but why when you can learn something?! Thanks!

  • @chrisw1066
    @chrisw1066 4 месяца назад

    Thank you!

  • @rl4899
    @rl4899 2 года назад

    Fantastic!!!

  • @macforme
    @macforme 5 лет назад +2

    WOW, the project even improved the color of the tiles....LOL

  • @southcoastsealantsltd
    @southcoastsealantsltd 3 года назад

    Great tips

  • @billruland1494
    @billruland1494 9 лет назад

    Love the tip about smoothing out the caulk. Thanks! I'll try it.

  • @user-pt8mq2xf1p
    @user-pt8mq2xf1p 4 года назад +3

    Better yet install 12 x 24 inch tile installed vertically with just enough space to use sanded grout (non sanded grout never holds). About 33 (12 x 24) tiles over the tub are all you need with minimum tile cutting. Cheap solid tile surround!!

  • @shaktijitdave8921
    @shaktijitdave8921 3 года назад

    Thanks man! V nice and to the point

  • @mxlen5019
    @mxlen5019 3 года назад

    So do I use the improvised hawk for the tiles on its own? Or do I have to mix it with something

  • @monaLisa-it3cc
    @monaLisa-it3cc 9 месяцев назад +1

    Do you have any video how to remove a broken key from the door ? Thank you

  • @cassandracollins6632
    @cassandracollins6632 2 года назад

    Thank you, Repairs 101........ I can do it....... !!!!!!!

  • @mariusghenghiu2692
    @mariusghenghiu2692 5 лет назад

    Nice !

  • @accomplishedtheory9502
    @accomplishedtheory9502 5 лет назад

    Did you use those grout tubes and squeeze those out on your hawk or did you use a different product?

  • @vijayreddy301
    @vijayreddy301 4 года назад

    Short and simple

  • @joshferguson4660
    @joshferguson4660 8 лет назад +3

    +Repairs101 Nice informative video! Love the channel logo. Keep up the good work brother!

    • @repairs101
      @repairs101  8 лет назад

      +Josh Ferguson - Thanks Josh! Rock on!

  • @TheEnergyball
    @TheEnergyball 3 года назад

    You had paint in the earlier part of the video. Did you paint the tiles? The end shot looks amazing...but looks like a different color tile.

  • @furnitechkenyalimited44
    @furnitechkenyalimited44 2 года назад

    It's amazing

  • @helmutsecke3529
    @helmutsecke3529 4 года назад

    Brother, what's the best type grout to use and must one use a sealant after?

  • @lilsoggins
    @lilsoggins 10 минут назад

    What grout/mud should I use? I had my tub “”professionally”” grouted and the grout they used was terrible and falls away in chunks.

  • @sahar4201
    @sahar4201 Год назад

    Omg the sound of you scratching the grout was horrible😭😭😭 got chills all over

  • @nelsonhernandez6764
    @nelsonhernandez6764 6 лет назад

    Wow you make me save money thanks you

  • @TheTaxman0608
    @TheTaxman0608 5 лет назад +4

    very labor intensive ! (hard)

  • @mesta9997
    @mesta9997 4 года назад +1

    Color and product name please... I have the same green tile that I'd like to paint in The more neutral blue green you chose

  • @maaldiar
    @maaldiar 3 года назад

    Thanks

  • @nosheenansari450
    @nosheenansari450 4 года назад

    Best... best.... best.... thank uouuuuuuu...... 😊

  • @iantman6664
    @iantman6664 4 года назад

    You people crack me up. Lol!!

  • @smartkiltedman
    @smartkiltedman 2 года назад

    u rock bud thx

  • @LD-wj2nd
    @LD-wj2nd Год назад +1

    Will be doing this soon! I just painted the mildew ceiling and walls with kilz and gave it some fresh paint! The tile kills the new look so I have to regrout it.

    • @repairs101
      @repairs101  Год назад +1

      You'll be so happy when it's done! Totally worth the effort!

    • @LD-wj2nd
      @LD-wj2nd Год назад

      @@repairs101 so I live in apartments and don't want to do all this scraping work (bad shoulder) can I just regrout it the way it is? I mean half of it is gone already. It fell out

    • @repairs101
      @repairs101  Год назад +1

      @@LD-wj2nd I would not. I recommend getting help to do the raking if you're not capable (pretty sure I mentioned it being physically challenging). Otherwise it's going to continue to fall out and ruin all your hard work. Adequate preparation is key to success.

  • @bonneepanyachith4017
    @bonneepanyachith4017 4 года назад

    What is the brand for the grout you use to put in a tile Mud,

  • @debbiebucciero3489
    @debbiebucciero3489 7 лет назад +6

    Are those the same tiles or did you paint them? They look bluer. This was such an easy informative video and I will be doing this in a few weeks. Thank you!!!

    • @repairs101
      @repairs101  7 лет назад +5

      Same tiles no paint no tricks - any apparent difference would be due to camera/lighting. Good luck with yours!

    • @beardedwoodsman9294
      @beardedwoodsman9294 5 лет назад

      I think he teabagged the tiles before hand,or maybe the tiles...or probably both

    • @PplCantDriveOkc
      @PplCantDriveOkc 5 лет назад

      Was prob lot of build up soap scum on. Bath im working on now in rental had layer of scum a scrspped off with razor and made tiles look way better

  • @karunapant4700
    @karunapant4700 3 года назад

    Hey my Mason has used white cement as grout will it be okay. Plzz reply

  • @miker8368
    @miker8368 9 лет назад +1

    Hello...thanks for sharing your knowledge. Was the original grout in your shower a sanded or non-sanded grout? If it was a sanded grout, did you have to remove all of the old grout or just a portion of the old grout prior to re-grouting?
    Thanks

    • @repairs101
      @repairs101  9 лет назад

      Mike R At 0:40 I point out (in the graphic overlay) that one generally uses unsanded grout if the gap is less than 1/8th of an inch (3mm) and sanded if the gap is greater than 1/8th of an inch (3mm) - my bad it goes by so quick - my filmmaking skills have improved some since then. That said, in answer to your question: it was unsanded grout (the gaps are small) and I removed a surface layer only, exactly as shown in the video.

  • @migsmegoy1359
    @migsmegoy1359 2 года назад

    nice 👍😊💕
    more please 💕👍

    • @repairs101
      @repairs101  2 года назад

      Sure 😊 !! In fact I have already created and published OVER 150 videos on my channel Repairs101.
      Check it out! ruclips.net/user/repairs101ca

  • @martinwork111
    @martinwork111 7 лет назад +4

    Great video! will this work on floor tiles as well? If yes, how much of the existing grout should i remove?

    • @repairs101
      @repairs101  7 лет назад +3

      Sure, but you"ll likely need heavier Sanded grout. Dig out as much of the old grout as you can. The more new material the better the adhesion.

  • @msnthrowp
    @msnthrowp 4 года назад

    Thanks Canadian🤪

  • @KAESowicz
    @KAESowicz 6 лет назад +3

    You should put grout on moist or even wet base.

  • @sparkuri
    @sparkuri Месяц назад +1

    Am I the only one that thinks this guy turned a 3-hour job into a 3 day job?

    • @repairs101
      @repairs101  Месяц назад

      I look forward to seeing your video on the subject.

    • @sparkuri
      @sparkuri 25 дней назад

      Do you?
      Ok

  • @Mixmaster.deejay.knight23_
    @Mixmaster.deejay.knight23_ 3 года назад +1

    How do you call that yellow tool you use? I need that.

  • @PhilmannDark
    @PhilmannDark 10 лет назад

    Can you please make a video about that last step? How do I get rid of excess silicone without pulling rest out?

    • @repairs101
      @repairs101  10 лет назад

      Definitely in the works but maybe not next.

  • @ginagee9186
    @ginagee9186 6 лет назад

    Great video thanks

  • @juanjohnism
    @juanjohnism Год назад

    Also what was the name of the tool you used to apply the grout?

  • @Dividenddream
    @Dividenddream 8 месяцев назад

    How long to wait for taking a shower after putting the new grout?

  • @CartwrightFour
    @CartwrightFour 4 года назад

    Funny location of the valves but good video

  • @srinivasanpadmanabhan1811
    @srinivasanpadmanabhan1811 5 лет назад

    Hello, Excellent Video. So you used the same Dow Corning Silicone sealant in between the tiles on the shower wall as well as in the corners? I saw some other videos ,, for corners they suggested using a material that can expand and contract in case of any structural movement ..hence asking...thanks again

    • @repairs101
      @repairs101  5 лет назад +1

      Some people like to make things more complicated.

    • @srinivasanpadmanabhan1811
      @srinivasanpadmanabhan1811 5 лет назад

      @@repairs101 Thanks for the quick response. I am gonna try your method.

  • @observer3693
    @observer3693 4 года назад +1

    Thanks for the video..!
    Any advice for a sealer..? when should i apply it... a day or two after grouting?
    I am using non sanded grout from Costume Building Products.

  • @DebbieTomkoSUNSHINE
    @DebbieTomkoSUNSHINE 5 лет назад +3

    Also, be careful ...when I did this on my mothers bathroom, tiles began falling off the wall...lol. I tried to get her to agree to have new white tiles put in, but she insisted on keeping the old pale blue tiles from 1970....lol. The only problem was, a few tiles broke from the fall....so I had to extend the shower/tub design (which were new) to cover the space for the missing tiles....lol. In the end, she loved it....well, except for the gloss sealer I used that dripped and ran down on the gloss tiles...I forgot to wipe the tiles off and didn't notice it, but when my mother was finally able to take a bath, (it took me a long time...a week or so), the first thing she noticed was the drips on the tile....:-(. I was too exhausted to try to remove and clean all the tiles, so I told her it would wear off.....:-) Oh, she only had one full bathroom....:-)

  • @DavidHager1
    @DavidHager1 4 года назад

    Cool

  • @johannadaabas4699
    @johannadaabas4699 7 лет назад

    I just did paint my tiles, and want to remove the paint from the grout, so it can look more natural & fill it in again. Can I still scrub on the wall like you did in the video without my paint coming off?

    • @repairs101
      @repairs101  7 лет назад

      I'm guessing no... but you should ask your paint supplier or the manufacturer('s website)

  • @oveidasinclair982
    @oveidasinclair982 6 лет назад

    Thank you, this has been vary informative, I plan on starting on my shower this weekend.

  • @karunapant4700
    @karunapant4700 3 года назад

    And the Mason used white cement without removing old grout.। Plzz help

  • @unclefrankonap1953
    @unclefrankonap1953 10 лет назад

    REAL NICE, JOB EXPLAINING STEPS.

    • @repairs101
      @repairs101  10 лет назад

      Thanks for commenting, Uncle Frank! Hi to Auntie May!

  • @trueblue2124
    @trueblue2124 4 года назад +2

    Interesting -didn't know that caulking you used was water proof tho - surely a sealant would be more appropriate - nice job -thank you -

    • @Sunnbuzz
      @Sunnbuzz 3 года назад

      Only use bathroom SILICONE

  • @willythehero88
    @willythehero88 4 года назад +8

    The grout lines in my bathroom are no more than 1/8". Grout has loosened or been removed in only a few spots, so filling them in with ready-made grout--like the tubes from Ace Hardware in this clip--should do the trick. The rest of the grout could be easily painted with one of those specialty, DIY products.

  • @kenmitchell3355
    @kenmitchell3355 6 лет назад

    Instead of caulking the bottom where the tile and tub meet can i just use grout? I have a shower stall that is ceramic and has a plastic floor and borders. I thought of just using grout then sealing it. Awesome video!!

    • @harlee886
      @harlee886 5 лет назад +3

      I hope you decided to caulk. Even though you can't see it, when you fill up your tub the extra weight of your body and water moves the tub down. Caulk is flexible while grout is not.