Surface roughness and paint film thickness Available to Purchase

IF paint is applied to a blasted surface in sufficient quantity the wet film will form a plane surface (neglecting variations in thickness due to spray pattern or brush marks) and there will be a greater thickness of paint over hollows than over the peaks. This condition can be accentuated if, in addition, paint flows from peaks to hollows during the drying process. When multi‐coat schemes are applied the surface profile is filled progressively by successive coats of paint (see Fig. 1); if sufficient paint is applied the dry paint/air surface may approximate to a plane. Estimates of paint requirements, albeit approximate ones, can only be properly made on the assumption that this condition will be attained.