I put 3 coats of epoxy primer on my cab today, and I can still see the bondo underneath. this was about 3 hours ago. Will it be a uniform color when it dries completely? I sure don't want to put color over something that looks like this. It seems like the bondo is soaking the primer in faster than the rest of the metal. WTF???
What grit sandpaper did you use to finish the bondo? You may have to sand it with a finer grit paper. In the old days we used to fill in the scratches and pinholes in the bondo with what we called "Red Stuff". It was 3M Glazing Putty in a tube, applied after priming the car, when it dried we would wet sand it smooth. Now people use high fill sealer/primer. I believe there is a thread about this that was started a couple of days ago.
There is bondo and hi-fill under the epoxy. It was sanded with 220. I planned on sanding the epoxy with 400 and painting.
I like the glazing compound myself, it seems to feather the edge nicer than straight bondo, but I am no pro.
Define how you see the bondo. Sand scratches or stains? I doubt that its sand scratches, 220 should be sufficient. Its is very common for filler to soak up the primer more so than the surrounding metal or exsisting primer. Most often times, I spot prime my bodyworked areas with 2 coats to achieve coverage, then move on to a full p***. Not to knock your experience, but are you sure you just didn't put the primer on too thin? 3 coats should have covered at least most of the spots.
They are more like stains or transparent. Maybe it is just too thin, but it seemed to cover the other areas fine. Can I just shoot more primer over the bondo spots,or should I sand first? Your right I don't have much experiance in this area, but I'm giving it a hell of a try!
you might not have used a good quality filler and are experiencing "bleed thru" or "staining", you need to recoat the stained area with a good high build primer and re-epoxy prime. they make stain free fillers which are a little more money but well worth it!
Hey, While we're talking "stains'' & " bleedthrough " of filler....... Did you make sure when you mixed the filler that it was NOT over- catylzed, mixed? This uasually becomes a problem only after the top coat has been sprayed, usually with light based colours. It does sound like you may have jus' over thinned your primer. I would strongly suggest you avoid the use of any "spot" type puttys, especally the old "green or red monster" types. S****ey Devils C.C. "Meanwhile, back aboard The Tainted Pork"
rage is one of the better fillers out there. i would block sand the stained areas after it dries and rescuff everything else and have at it one more time!
I did use some 2 part polyester spot putty, but no lacquer based spot. I'll scuff the light areas and shoot them again tomorrow.
Absolutely! One way to learn is by diving in, thats how I picked it up. What I would do is use the primer thats on there to your advantage. After all you did pay for it and it is on the car. Spray a quick guidecoat and block it one more time with 150 then finish up around 320. That way it will be extra straight! Mix up some more primer and spot those bodyworked areas twice, make sure you get coverage. The primer should spray out wet, but try not to run it. Once it flashes and looks dull, hit it again the same way. Then move on to 2-3 full p***es. I don't think its a case of the filler bleeding through the primer after its cured. More like a case of not so good coverage.
This is normal ( at least on the projects that I have done) The bondo seems to absorb the chemicals in the paint causing a discolor. I use Evercoat high build poly-primer and it always shows on the first round of primer. Just block out any imperfections and the re-primer. It should be fine.
Thanks, that makes me feel better. Now I know why a quality paint job isn't cheap. Most people just see the shiney and don't even think of all the hard work that makes it that way!
No prob. I'm just happy to see you are learning on some decent materials and trying to do it right rather than shopping at Home Depot.
once you shoot some more primer to it, Let it sit in the sun or use a bakelite if possible this should insure that the plastic wont ever bleed threw from just from sitting in the sun at say a car show, If this happens it will cost alot more to fix then.
I like to let my first coat tack good then lightly sand it with 220 or finer.. then blow on a couple more coats..... Seems to work for me. Lowlidx50
Yeah, that's totally normal. It's just that the patches of bondo soak up the primer differently than the metal but epoxy is the way to go. Just let it dry and give the entire truck a light sand with 400 grit and apply a couple more coats of epoxy. Should turn out real slick. The only thing about epoxy as well as polyester primers is there's no UV protection so if it sits out in the sun a lot it's gonna fade and turn dark gray.
One word - sealer. Then everything will be super normal. Sounds as if the primer bleed and change of color is normal. A sealer before base coat is the next step.
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