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topic 10650

Why abrade aluminum if you are using Acid Etch


Do we have to abrade aluminium before applying a two pack acid etch? We at present abrade, clean with Gramos Pre-Wipe, then apply the two pack etch. I would have thought the etch would burn into the aluminum to create a bond for the powder coating, but the supplier of the etch Cromadex say it is best to abrade first.

Richard Rinn
Insight Sign Systems - Glasgow, Scotland, UK


The better the mechanical lock, the better the adhesion. Apparently the abrasion adds a different dimension to the surface, which is enhanced by the chemical etch. You should try an adhesion test both ways.

tom pullizzi monitor
Tom Pullizzi
Falls Township,


Dear Tom, thank you for your reply, we do get good adhesion with out abrasion but do not want to risk a problem in the future. We would like a company who manufacture etch primer to tell us 100% we do not have to abrade, or if we abrade we do not have to etch. We have been told by some companies that a product named SANDCHEM can be used with out abrasion and this is a lot less harmful, I have still to find it and see a specification in print confirming this. I will just have to keep trying.

Best regards,

Richard Rinn
Insight Sign Systems - Glasgow, Scotland

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