How Far Will Your Paint Pen Go? Testing Air-Dry Metal Roof Paint Pens

How long will a metal roofing touch-up paint pen last and how many linear feet can it paint?
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An air-dry touch-up paint pen is designed to apply paint to very small scratches or cut edges of painted metal roofing and wall panels, but how long will one last? In this video on the Metal Roofing Channel, Thad Barnette tests how many 12-inch lines can be painted before the pen runs out. Note that because this is not a typical installation method, your results may vary.
You should ONLY use paint specifically designed for air-dry metal roofing applications.
Please note the installation methods shown in this video are for reference only. Sheffield Metals recommends following manufacturer's instructions for installation. Areas utilizing touch-up paint is not covered by the manufacturer's paint warranty.
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[@TheDroppedAnchor]

For those of us who are perplexed - Sheffield Metals makes their own ink pens and this is what he is testing.

[@worldpeace8187]

Could this be used on a car?

[@TheMetalRoofingChannel]

The paint pen I used is made for metal roofing and walls, but car manufacturers usually make paint pens that are specific for their vehicles as well. -Thad