PDA

View Full Version : Frame & Body Painting & filling under-body fiberglass.


Jeff K
11-25-2013, 12:25 PM
I have my car up for it's winter project.

I want to recon the under-body. The fiberglass looks bad, many scratches and grooves. Which I can't image how they got there, bottom out real bad I guess.

I want to fill the grooves and paint (or rubberized undercoat).

Any suggestion on material? I read SEM black is good for this? Any thought on the roll on rubberized undercoat?

Thanks
Jeff
OverlandMan
11-25-2013, 01:42 PM
Curious to see the replies you get. I would think that prepping and laying new fiberglass and resin would be the preferred method. I've done this on the rear louvre but not on the under-body itself.
Jeff K
11-25-2013, 03:16 PM
Actually, I can get away with just painting it. No real damage except a few scratches that can't be sanded out. (too deep)

3M makes Bondo-Glass reinforced body filler - basically fiberglass bondo. That would work well for this.

Jeff
LEVY
11-25-2013, 03:27 PM
Actually, I can get away with just painting it. No real damage except a few scratches that can't be sanded out. (too deep)

3M makes Bondo-Glass reinforced body filler - basically fiberglass bondo. That would work well for this.

Jeff

Any kind of automotive bondo should do it, the thinner the better.

Stay away from rubberized products, will not stick to fiberglass very well.

LEVY
David T
11-25-2013, 04:51 PM
Any kind of automotive bondo should do it, the thinner the better.

Stay away from rubberized products, will not stick to fiberglass very well.

LEVY

If the size of the scratch is too small you may have to shape it so that the bondo can stick better, especially if it has chopped up fiberglass in it. There may also be dirt which the bondo won't stick to so deepening the scratch may be necessary just to get to clean materiel. Once repaired, flat black spray paint should do fine. The problem with rubberized coatings (like truck bed liner) is that you must get the surface clean or it will just come off. Hard to do with dirty 30 year old fiberglass. Besides, you shouldn't have to protect it. If the car was lowered you may have to repair the bottom on a regular basis.