Well i wasnt going to do this yet. But my grandmother backed into my car three times so now im getting a new door and QP


i dont have the money to get it painted yet, But im not driving a civic with 3 diff colors Orange red and black.

So my question is, WHats the best primer to use ( I wanted grey or black ) and how long will the primer hold before it rusts, or is there any primer that helps prevent rusting?

 

Check the how-to paint your vehicle on the sticky threads.

 

Quick Q: How did she back into it 3 times? Lol

 

just go to your paint store and ask them what they reccomend....it wont rust unless you have bare metal. all i would do is sand the entire car with P-320 grit paper and then spray primer it and you will be fine

 

That's not true at all. Primer will absorb moisture. You don't wanna spray any primer unless your gonna paint over it. Epoxy primer is made to spray over bare metal to seal it from moisture but then you should spray 2k over the epoxy after you do any body work so that way it can be blocked out. Epoxy is not meant to be sanded. If your replacing a 1/4 panel then you will have a lot of work ahead an you will need both types of primer plus it will need a base coat after it's done. Go to a reputable paint shop and talk with them about it. I have about 350 in materials and I didn't have to buy a 1/4 or a door.

 

yes i understand that....and if you see i said if he sprays primer over bare metal it will....if you spray primer over scuffed base it wont rust.

bc i scuffed my car and primed it and it sat for about 3 weeks outside and i didnt have any rust spots on the car

 

Primer is porous and it WILL absorb moisture no matter what you do unless you put paint over it. If you spray primer over scuffed base it will absorb moisture and cause problems in the end. Your car will start rusting from under the paint and a few years later "or less" it will come back to haunt you.

 

once again i know this...he is priming now and gonna paint later down the road. thus he will have to block the car and either re-prime or seal then base

 

This statement is not 100 percent true. Primer will absorb moisture, yes. But it depends on the primer you use. Epoxy primer alone isn't 'ment' you be sprayed over bare metal. yes it's good for shooting over bare metal because epoxy primer by nature is anti-corrosive, or corrosion resistant; Protecting the metal from moisture, and thus, rust. In addition to this, spraying a 2k primer over the epoxy is nice because it sands easier and goes on thick, which helps in getting it straight, although it's not necessary to do so. Epoxy primer is normally used to protect panels and seal everything before you paint, but yeah you could sand it, there's no rule that says you can't.



Again, it depends on the primer that you purchase. If you use a primer which isn't anti-corrosive then you will run into issues.

Let me get this straight, you're saying that if I scuff my basecoat/clear coat, apply primer over that.... it's going to rust in the end? Please explain how it is possible for mouisture to penetrate all the way through the second clearcoat, the second basecoat, the second primer, the first clearcoat, the first basecoat, the first primer, and react chemically with bare metal?


moral of the story. I have sanded to bare metal, sprayed primer, driven around for months on end, scuffed it, sealed it, painted it.... never hard any issues. ALSO, I've sanded down the painted and re-sealed with epoxy and driven around with that for months and months on end, in a climate that is very very wet...and haven't had any issues with rust on the COVERED areas. Granted, there are break throughs that have rusted minutely, but that's because it wasn't covered with primer.


Just make sure that your primer is anti-corrosive, and you'll be fine.

 

Just spray a sealer over the sanded primer surfacer.

 

and then sand that when your ready to paint later?

 

It depends on the kind of primer. You'll want to follow the manufacturers instructions about painting over it. In some cases, you can just scuff it up and then paint over it, sometimes you have to scuff it up, re-seal/re-prime, then paint over that. So it depends.