SikaWall®-603 Acrylic

Ready-to-use acrylic skim coat
SikaWall®-603 Acrylic is a skim smoothing rendering paste that is used for levelling uneven surfaces and repairing surface defects in concrete, plasters and drywalls. A smooth surface is obtained by eliminating blemishes such as grooves, seams, fine cracks and blowholes.
Application thickness of 0.3-4.0 mm
White smooth finish
Excellent trowelability
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should i apply sealer first on a painted wall before applying sika wall acrylic or the other way around?