Idk why you say this I’ve used spray cans of self etching with great results. All self etching means is that it’s bites into the metal , usually a form of acidity
2 part give off isocyanates which no respirator stops so use an air fed.
I also always wipe down anything I’m spraying with vinegar it gives it a great tooth to grab onto it. This does the same as a self etching primer . Epoxy encapsulates and to some extent bonds
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