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Discussion Starter · #1 ·
I'm doing a small fiberglass enclosure for my Hyundai. Everything has gone well exept for the sanding part. My goal it to paint the enclosure. I did the bondo coat, sanded, bondo, sand, bondo and sand. Just started priming it this morning when I realized there are a couple of pin holes that the primer won't fill where I sanded down to a small air bubble in the fiberglass.

Can I put bondo on top of primer? Or do I have to sand the primer off?

I am worried about the fiberglass getting too thin in that area.
 

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bigjae1976 said:
I'm doing a small fiberglass enclosure for my Hyundai. Everything has gone well exept for the sanding part. My goal it to paint the enclosure. I did the bondo coat, sanded, bondo, sand, bondo and sand. Just started priming it this morning when I realized there are a couple of pin holes that the primer won't fill where I sanded down to a small air bubble in the fiberglass.

Can I put bondo on top of primer? Or do I have to sand the primer off?

I am worried about the fiberglass getting too thin in that area.
Step one - don't use bondo brand filler - if you must use bondo brand, use the Ultimate (comes in a blue can) and is far superior to the "pink" stuff....

What you need now is some kind of putty. I use a product called Icing - I forget who makes it, but it's a paintable or pourable filler. Works in the same manner as bondo, only it's thinner and easier to sand. This is always my final setup before paint.

Pin holes are a part of using regular bondo brand. If you have sanded into an air bubble in the glass, then you are going to have to build it up with something better then bondo - I'd you could mix up a milkshake or used some fiberglass reinforced filler - like dynaglas, or you could mix up some bondo, then add in some fiberglass strands to make it stronger. Too thick of bondo, and it will crack.
 

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Discussion Starter · #4 ·
Thanks...I guess I'll just live with it. Not a big deal since this is going into my Hyundai. Just seeing how painting would work out but I can always carpet it.
 

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i've heard mixing bondo with some resin can fill up those pin-holes. i've never tried it though. i guess you would have to make it somewhat watery.
 

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Discussion Starter · #6 ·
Painting fiberglass is a real pain in the ass. I guess if I want it to look perfect, I'll take it to a body shop next time.

Still, it looks decent enough for my Hyundai.
 

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it depends on what part of the glass you are painting. If you are using fleece or grille cloth to stretch over a frame, then re-inforce that with glass, then it's very easy...just apply your reinforcement to the back side of the part.

If you want to lay glass down, then paint over that directly - that will take a lot of time....
 

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Discussion Starter · #8 ·
Its over fleece. The problem is my inexperience :cry: but I am getting better.
 

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well, in that case, I'd start by knocking down most of the bumps in the fleece with some low grit paper, then bondo the piece, then sand (always use a block), then guide coat it and see where you are from there.

working with bondo is not easy by any stretch of the imagination....
 
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