Sandblasting does rough the surface and yes it helps but for different reasons.1- by roughing the surface you increase the surface area slightly.
2 you create places for the powder to physically get in to the nooks and basically hold on.
3- it physically cleans the surface of paint,dirt and oils that prevent adhesion.
Zinc is a conversion coating that attaches to the aluminum and then the powder bonds to the zinc. <- this is over simplified but you get the idea.
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Powdercoating Aluminum
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Originally posted by DALENo, it's not needed but it does help promote adhesion.
TIA
Karl
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Powdercoating Aluminum
Do you need to zinc chromate aluminum before powder-coating it?
Thanks,
GeorgeTags: None
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