Posted: 6/20/2009 1:51:28 PM EDT
|
Im filling some holes on my truck bumper. In the past when using bondo even after using 2000 grit paper, light spray of primer and sanding that after the paint is applied you can always see where the bondo is, it seems to soak up the paint differently. Now I always use spray paint so I think that may be one part of the problem. But once I used jb weld on a project and sanded it down smooth and painted over it and it was almost impossible to see where the patch was.
Is there another product that goes over bondo to help it seal up better or another trick to make it not soak up paint differently then metal. |
| Just finished about 10 min of sanding with 2000 grit, used some primer I had here, dont feel like going anywhere to buy some that may be compatible ( sorry cant drive my truck all bondoed up ) and it looks like orange skin texture where the bondo is. Going to sand some more, funny if felt super smooth but looks like the moon after primer is on it. |
| First off all , " Bondo " is a certain brand of body filler , not to used to describe all body fillers. Bondo brand filler is total crap that you will find at Wally World. This stuff is very sub-par and will never be found in a respectable collision shop. Now , regardless of which filler you use, the filler should be finish sanded with 220 grit paper then primed with a urethane high build primer surfacer,three coats. Let the primer cure for a couple of hours and block out and finish sanding with 500 grit paper. Then you can proceed with painting. |
| Well I did more primer coats, pretty thick and it seemed to fill in the bondo imperfections. Also since im using flat paint that helped hide it too. Seemed to come out better then other projects ive done, mainly because I did more primer coats then before. All items were bought at home depot so im not sure what exact name brands were used, nothing good quality just cheap. |
|
Quoted:
Im filling some holes on my truck bumper. In the past when using bondo even after using 2000 grit paper, light spray of primer and sanding that after the paint is applied you can always see where the bondo is, it seems to soak up the paint differently. Now I always use spray paint so I think that may be one part of the problem. But once I used jb weld on a project and sanded it down smooth and painted over it and it was almost impossible to see where the patch was. Is there another product that goes over bondo to help it seal up better or another trick to make it not soak up paint differently then metal. NOOOOOOOOOO! Don't do it man!! Take it to welding shop and give them a few bucks to weld the holes. Never,never.never,ever use Bondo for anything ever. After you get the holes welded go to a auto paint supply store and get some vinyl body filler. Grind the welds down,use the filler to smooth it out and then prime&paint. Bondo is evil in a can 
|
|
Quoted:
Well I did more primer coats, pretty thick and it seemed to fill in the bondo imperfections. Also since im using flat paint that helped hide it too. Seemed to come out better then other projects ive done, mainly because I did more primer coats then before. All items were bought at home depot so im not sure what exact name brands were used, nothing good quality just cheap. You essentially kept coating it until it was sealed: Most body fillers will absorb the solvents in the paint product at a different rate than surrounding surfaces. This will cause shrinkage too, making the location obvious. A primer-sealer should be used to cover it prior to priming and/or painting. This would seem like a lot of trouble for a bumper.................................. FYI, anyone that sees this thread that has needed glazing to fill pinholes in body filler, Rage Extreme body filler did not seem to require it. It is pricey, but it is a huge time saver. I still sealed it with PPG DP 40/70/or 90 |
|
It seems you have a bump where the bondo patch is and when painted it is still raised above the surface. Flat areas are hardest to blend I think and it helps to use a sanding block. Curves are pretty easy to do by hand for touch up. Also try a random orbit sander for the main sanding, on slight curves or flat areas. I did my buddies '83 supra and with a little more blending(ran out of sunlight) It was basically unoticeable.
It's a definitely not a permanent fix by any means, but it will fake most anyone done right. |