ApplicationCâu 51 / 100
What is the difference between wet film thickness and dry film thickness?
a.They are always equal
b.Wet film thickness is measured immediately after application; dry film thickness is what remains after solvents evaporate
c.Dry film is always thicker than wet film
d.Wet film only applies to spraying
Giải thích
Wet film thickness is the depth of the coating right after it is applied and is checked with a wet-film gauge. As solvents or water evaporate, the film shrinks to its dry film thickness, which equals wet thickness times the volume solids. Controlling wet film during application is how a painter hits the specified dry mils.
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