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Ask the Expert Question-and-Answer Archive by Ron Joseph May, 2006 Calculate the Weight of Paint Coating on a Ladder Q. We are designing a pilot ladder for the military and must keep the weight low. I have been tasked with determining the weight of the paint! I calculated the surface area of the ladder, I know the thickness of the primer and 2 coats of paint, but I cant seem to find the density of paint because it is directly related to VOC and solid percentages, right? Anyway, if I have the Mil-Specs (paint Mil-C-83286, and primer Mil-P-85582) can you tell me the best way to calculate the dry weight of the coating? A. The weight of the solid paint is given by % Wt solids x Density of coating
(lbs/gal). You will find both the % wt. solids and the density of the coating
on the MSDS. The density of the coating is sometimes stated as WPG or weight
per gallon. If the vendor gives you the specific gravity of the coating (SG)
multiply it by 8.33 to convert SG to density (lbs/gal). Therefore, you can now
easily calculate the weight solids in a one gallon can of the coating. Best wishes, Ron Joseph |