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washing it after blasting is additional insurance, if your worried about flash rust that can occur just from humidity, if it does hit it with 80 grit on a DA and get rid of it.
After blasting there can be contaminant on/in the metal-it needs to be scrubbed off, dawn works well because it doesn't have abunch of other things in it, scents, etc.....& it leaves no residue if rinced properly.

I've painted many parts with epoxy after just a dawn scrub, no epoxy failures. Wax & grease removers won't get everything , the cleaner the part you start with the less W & G work necessary.

If you do a lot of DA sanding for paint removal that can force residues into the metal - don't worry about the water rusting a hole in the car just make sure it clean prior to any paint. All in the prep....



This. All my stuff gets cleaned with dawn soap and water. Get it cleaned, waterboure wax and grease remover and 2 coats of epoxy. Question for those of you that sodablast cars, How do you neutralize the soda before painting? The answer to that question is you wash it with water/soap and do it a couple of times. YES SOAP/WATER.