Sandblasting / primer

After blasting metal body panels why should I use epoxy primer over sand in fill primer if the surface is clean whats the difference ?

 

Epoxy filler seals moisture out better than sandable. Also eliminates the chance of topcoat reacting with the primer. No doubt others will elaborate but that's why I do it.

 

epoxy primers have the ability to adhere and seal the bare metal better. totally necessary no, better yes.

 

Epoxy primers have corrosion resistance properties, filler primers normally don't.

 

Lots of reading and good discussion. There are a lot of other good threads, too.


http://www.jalopyjournal.com/forum/showthread.php?t=381410&showall=1

http://www.jalopyjournal.com/forum/showthread.php?t=433769

 

Depends if you want a traditional car or not. If you want it traditional, you put up with the faults of the old lacquer primer (if you can still buy it where you are). Modern stuff is better, but it's more hazardous, doesn't crack or shrink properly, adheres too well, etc.

 

Im an auto body technition of 17 years and 46 is right about the epoxy. but they do have high build sandable epoxy primers. A cheaper alternative to epoxy is urithane high build sandable primer it also has a hardener and will work the same. If the car is stored in a desent garadge you could get away with the cheapest of cheap enamel high build sandable primer but you will want to use a epoxy or urithane for your last prime and a sealer before you put color on it. What ever rought you take use the same brand primers, sealers, and paint to eliminate the chance of solvent related paint problems.

 

That's funny. Plus you can't spray epoxy from a vacuum cleaner. It's not traditional.

 

Epoxy Primer is definately the way to go. Omni (PPG) makes a good Epoxy Primer. Two wet coats and you're done.

Good Luck.

VR&C.

 

try z-chrome rust defender....super high build(basically like sprayable metal glaze)...builds somethung like 10mils a coat... also has a rust inhibitor and u can sand a filler right over it...good stuff no voc's and is like 86% solids...

 

Thanks ! I was wondering if there was a sand able epoxy primer out there. Would this sand able primer be a DuPont product ?

 

block sanding this stuff is a great workout! good stuff fills deep rust pock marks.

 

i would'nt worry bout it, give ya something to do in about 2 years.

 

Epoxy Primer, The Sport Coupe shell I have was blasted and put in Epoxy primer 2 years ago. No rust anywhere and that is in Houston's humidity.