Microscratch Resistent Coating


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Q. I have recently coated some objects with a high gloss black powder. I have noticed that when I rub my thumb (which is pretty rough) across the surface, that I can see some micro scratches. I have experimented with the recommended 1.5-3 mil, baking time and temperature. I then Scotch-Brighted the parts, recoated them, resulting in a total 6-8 mil, increased the temperature 25°F over recommended temp and increased the time eight mins. I am still able to make the micro scratches. Applying Mother’s wax over the parts made the scratches less obvious. Is there any way to make a powder coated part micro scratch resistant? J.C.


A. The phenomena you are describing is called “marring.” Mar resistance is formulative property inherent in the powder coating. This means if you apply and cure the powder coating properly, then you will get the expected mar resistance. However, if your coating does not have the mar resistance you desire, then you must obtain a powder coating that is harder and more mar resistant. Be aware however, that high gloss black powder coatings are very susceptible to fine scratches. Remember, that this is an organic coating and not plating, which is much harder and more scratch resistant. If a harder powder coating does not give you the performance you need, then look elsewhere for a solution. 

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