Body Work Question

[OldnRusty]

Okay, here is my question...I had to do some body filler repairs and need to know if I can etch prime over filler or is that a no no? If I cannot, what do I use to coat the body filler? Next question... if there is some minute rest exposed, will the etch primer eliminate that or so I have to figure out a way to sand the rust off? Any help is appreciated. Oh and its for a 1964 Chevy truck Step-side SWB.

AJ

[Alan's Classic]

moved ya to paint and body.

[hugger6933]

I would'nt use acid etch primer. I would suggest the use of epoxy primer. and yes you need to sand off the tiny bits of rust forming around the filler. Epoxy primer has no fill properties [neither does etch] so after you prime 2-3 coats of epoxy[spray the first just on the filler as it tebds to soak up the first couple of passes], I say go over that with a high build primer[2-3 coats] and block the body spot out and spray acouple of more coats then you are ready for paint

[CC69Rat]

I would:

* Sand the repair area with ~80 grit on a DA, down to bare metal.
* Do the repair work and hammer / dolly out as much of it as you can. With as minimal filler as you possibly can, right on the bare metal.
* Block the filler as best you can to get it as flat as possible (I use 120 on a DuraBlock)
Epoxy prime ( I use DPLF - PPG ) the bare metal. Epoxy needs to cure for 24hrs. Do not allow to sit in DPLF for more than 7 days. 2-3 light / medium coats
* Scuff the DPLF ( I use red scothbrite )
* 2-3 Coats of high build primer SPI / Omni / PPG depending on your preference
* block with 220 - DuraBlock ( should begin to get 'slick' at this stage )
* re-prime with high build - 2-3 light coats being careful not to build too quickly. Let each coat flash / cure before the next.
* guide coat and block again with 400

Depending on the color you choose and metallic or non-metallic you might need to consider blocking to 500/600 to hold down on sanding scratches. Metallics will fall back in 400 sand scratches.

Seal, base, clear ..

[HuggerCST]

These guys are giving you good advice. Even though I don't care for DPLF, I would use epoxy also. In most cases etch is not to be sprayed over filler.