Q. Is it ok to apply 6 coats of finish to a VCT floor?
A. Most manufacturers recommend only 4 coats of finish to be applied within 24 hours. The reason is that the finish dries, but does not cure all the way down through the layers on the same night. Sometimes a 5th coat will even begin to attack the previous coats and show some softening and dissolving. That is because ammonia is used as a carrier to speed up the drying. But too much of a good thing is counterproductive, and ammonia may start to cut into the finish.
You could apply 4 coats one day and two the next, but normally the floor is scuffed and marked up within 24 hours, so you would have to lightly scrub it before applying 2 more coats. However, some high solids finishes with 25%-30% solids are very thick and only require 3 coats on VCT.
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