fs93543
Active member
I was just wondering if theres any painters out there, would you spray self etching primer over Bondo? Will it still work or what kind of primer do you use over plastic filler and bare metal?
Depends what your doing...If it's a part... say a motor bracket that you smoothed out then self etch would be fine...If it's body panels then I would strip to bare metal..Sand with 80 grit on a d.a.I was just wondering if theres any painters out there, would you spray self etching primer over Bondo? Will it still work or what kind of primer do you use over plastic filler and bare metal?
Q knows his stuff. My method is very similar, but a little less conventional, I use an etch primer (P565-597 from PPG's NEXA Autocolor line) followed by 3-4 coats of surfacer (NCP271 corrosion resistant primer by PPG) block out what I can with that, body filler ON TOP of the NCP271, then spray polyester, block, touch up body filler where needed, then more surfacer, final block and finally paint.Depends what your doing...If it's a part... say a motor bracket that you smoothed out then self etch would be fine...If it's body panels then I would strip to bare metal..Sand with 80 grit on a d.a.I was just wondering if theres any painters out there, would you spray self etching primer over Bondo? Will it still work or what kind of primer do you use over plastic filler and bare metal?
Then epoxy prime...then filler work ON TOP of the epoxy...seal filler work with epoxy...then 2k primer..
I've been using spi products great stuff..reasonable price...
http://www.southernpolyurethanes.com/
Yes. You must protect bare metal with either epoxy primer or etch primer. If you don't, rust eventually will return or begin anew.Thanks Obsidian!! One more thing though, What if I just Spray the 2k surfacer over the whole thing without using etching primer. Will it rust out?
Yes, etch or epoxy is definitely needed. Surfacer isn't designed (typically) to go direct to metal. Few will do a decent job, but it's always best to go with an etch or epoxy 1st. Surfacer is designed to be able to block out minor flaws before paint, not corrosion protection.Thanks Obsidian!! One more thing though, What if I just Spray the 2k surfacer over the whole thing without using etching primer. Will it rust out?
True, I go etch to surfacer, a lot of guys go epoxy because it saves a step. I go to surfacer because it has more build to get my blocking started and help me find my highs and lows.I forgot to mention: after etch primer, you'll need to apply a sealer. Epoxy does the job of both.
Enter your email address to join: