Prep for Epoxy over sandblasted steel?

shine;40792 said:
throw the etch primer in the nearest dumpster. and no epoxy does not shrink and swell.


Throw Etch primer in dumpster?? But.. But.. ASE says...... :eek-new:

I agree with Shine I would go straight to Epoxy No other material under it. 2 good coats 3 if it makes you feel better, FWIW 3 makes me feel better.
Etch primer has acids in it and can cause problems and this type work is hard enough without adding problems. Stay with SPI through out the project and don't look back.
 
I'm not saying that. I already bought the SPI!
I was just wondering if my surface is TOO rough will the epoxy fill it and will it shrink in the summer under my base coat causing paint issues? I've heard etch does this-just wondering if the epoxy will shrink also..
Yeah, we will be spraying it all next week-can't wait!
I need to do some very minor fixes on the body early on in the week though before we spray it. The only issue I had was the sunroof skin was rusted underneath (bought a new one) and there is some rust in the corner of the rear window.
 
So what do you think you will spray on the body that will shrink less than epoxy? There isn't anything except maybe poly primer, and that is not DTM (Direct-To-Metal). So epoxy it is. Any coating that has solvent or even water in it will shrink as the "vehicle" or thinners that made it thin enough to spray evaporate out. But the big advantage of epoxy is that once this has occurred, it cures and becomes "non-reversible," and won't absorb solvents from later coatings. That and many other properties set it apart from other primers.
 
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