Hi, I did a little bodywork and just sprayed it with a couple of coats of primer when I was done. Now I noticed I have rust coming through the primer. What did I do wrong? Whats the proper way to clean/seal/paint. Or do I need to paint over the primer right away? I thought primer was ok on its own. Thanks for any help guys.
CoryM

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1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada
FWD SUCKS!http://www.geocities.com/chevroletc1070/

how clean was the metal before you primed it? some primers hold up a little better than others but none will last forever. if you have clean metal and use a two part primer(epoxy) it would last a while. some one else here will be able to explain it better.

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68 swb fleet soon to be bagged and big block powered
68 lwb fleet in primer
35 chevy truck
97 dodge on 35 boggers
3 out of 4 aint bad!
Jefferson city, MO

You might want to look up what primer you used and edit your post. There are primers that will rust...I have had that happen. The PPG DP epoxy (two part) primers are exceptional at preventing rust. You might also mention how long it has been since you primed your truck. Others will need that info to help you more.

Epoxy primer is the way to go to seal up the body if you dont get around to painting for a while. And I don't mean that epoxy primer you can buy at the hardware store, I'm talking multi-component stuff you have to mix and spray with a paint gun. I did a test and shot some Dupont epoxy primer on a set of inner fenders and left them outside, happened to be on the north facing side of the house too! Well, a year later absolutely no rust.... I was seriously amazed!

Also consider the fact of all paint is pourous, that means without waxing paint allows air & moisture to pass through microscopic pores and gets to the metal andf rusts it from behind paint out. You will want to use a primer sealer if going to leave for long unpainted.
PS- Don't wax the primer but after finish paint a regular waxing will help prevent rust damage more that anything else due to fact wax is non-pourous and air and moisture can not pass through it.
GMCPaul

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If you used an acrylic primer surfacer, it will actually absorb water like a sponge. Same with Bondo. You have to use an epoxy, or urethane-based primer, or at least a good coat of primer sealer over the primer. You'll want to wet-sand the primer first. Since there is rust coming through the primer, it all has to come back off.

i think it depends on how fast the paint dries (type of reducer used). i believe you shuld wait 30 days before wax or is that wash a car?

Rule of thumb for most paint jobs is 90 days before wax.

My 2 cents. Like others have said, primer is just that. Any primer will absorb water if left in standard form. The DP epoxy is most resistant but it will rust through in time like primers, primer surfacers, or primer sealers. I prepped and primed a new hood, cut in the edges and underside with a topcoat but happened to leave the center primer exposed. When it was time to paint it all, I had trouble getting it to feather, so I stripped it all and started over. The center was actually corroding under the primer but had not "come through". A way to minimize this, some people have put a checker coat of final paint down to help seal the surface, if it will be exposed. This is easier with lacquer, but may or can be done with other paints. You have to know the system and the windows for repaint, rescuff, strip, etc to prevent too much work. You may not have cleaned or removed "all the rust" and it may have come back after being exposed to moisture and time. Hope this helps some.

Thanks for the info guys. I need to learn the finish work better I think. I can do the rough stuff but the final prep stuff is still unknown. Going to get some books etc I think.
Thanks again.
CoryM

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1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada
FWD SUCKS!http://www.geocities.com/chevroletc1070/

Read all of the paint and body articles in hotrod magazine. Lots of good info there too!