Self etching or Sandable Primer?

[drase]

I'm sanding some surface rust off the MJ to the bare metal, I bought some sandable primer to spray on the metal, but I noticed alot of guys on here use self etching on the metal. What is the major difference between the 2? Should I take back the sandable and get self etching?

[veritas4156]

Self etching attaches to bare metal really well. Sandable does but not as well. Self etching doesn't seal as well. Sandable is sandable (builds up higher). Self etching will rub off if you sand it.

 

Self etching usually comes in a really cool green color.

[thedave360]

I've done exactly what you are talking about. If you're going to bare metal, definitely use the etching primer. I primed my hood with it and painted it. I have had zero rust come through.

[75sv1]

Why not do the first coat with the self etching, then a coat or two with the sandable primer?

Tom

[dasbulliwagen]

:agree:

 

Get both, start with the self etching, and then top coat as many times as needed with the sandable. The etching primer has a kinda acid based thinner that allows the primer to bite into bare metal better. Most body shops if starting with bare metal, will put a coat of etching primer down first before the sanding primer.

[Carl'sMJ]

:agree: Self-etching primer should be used in conjunction with a sandable primer.

[drase]

Thanks guys, after I posted this, I did further research on internet and talked to ppl and they all confirmed what has been posted.