fibreglass work questions.

[simpsons7s]

I have fibreglass bumpers and they have large holes in them as part of there styling I don't like these and I want to fill them and make them flush. The holes are about 8"x4" and 8"x1" Any ideas as to what kind of material to use to fill them? I was thinking using cardboard or tin as a base then using bondo on that.

 

[lppro]

bondo = bad.... it will look like poop

 

[m1supra]

I would think the bondo would crack when the bumper flexed. fiberglass filler maybe????

 

[upgradedsupra]

I have fibreglass bumpers and they have large holes in them as part of there styling I don't like these and I want to fill them and make them flush. The holes are about 8"x4" and 8"x1" Any ideas as to what kind of material to use to fill them? I was thinking using cardboard or tin as a base then using bondo on that.

Buy some fibreglass matt, catalyst and some resin. Grind around the hole taking any gel/clear coating off as this will make the matt/resin stick to the bumper.

You will need

Catalyst
Resin
Matt (material)
Grinder
Brush/roller
Something to mix with

I would use some cardboard and put wax on it. This way when the matt dries, you can take it away without it sticking. You will need to use more than one layer of material. I would say use 2 layers on the 1" hole and maybe more on the larger one. This is all I can come up with without seeing it. After this is completed and dried, you can use filler to finish the part off

HTH
Duane

 

[simpsons7s]

Thanks Duane for that info, couple more questions though when using wax on the cardboard are you talking about candle wax or is there a spray wax or can I use some plain surfboard wax, or does it not really matter as long as there is a layer to seperate the cardboard from the resin?
Second when you said That I could use filler to finish the part off, did you mean Bondo or use just resin without more fibreglass matt?

 

[Clip]

paraffin wax (bought at the grocery store for canning). ive also used aluminum foil to cover up forms that i fiberglassed over, but i had to use a wire brush on a drill to get all the small crumbs out of the back of the finished fiberglass. when you use filler, you can use bondo but look for a higher grade finish filler, something thats a little thinner and easier to work with. check at the local body shop or auto supply place, they can usually tell you what people in the area have.

 

[upgradedsupra]

Thanks Duane for that info, couple more questions though when using wax on the cardboard are you talking about candle wax or is there a spray wax or can I use some plain surfboard wax, or does it not really matter as long as there is a layer to seperate the cardboard from the resin?
Second when you said That I could use filler to finish the part off, did you mean Bondo or use just resin without more fibreglass matt?

As clip mentioned foe the wax

As far as finished part... evercoat 446 or something like that would work.
This is a paste putty that levels like a pourable putty and has great sand ability. It cures quick to a sandable state which is what makes it great for any spots that need to be filled. This also has the cream/hardener included.

Resin is hard as a rock when cured and will NOT and should not be used. It is not sandable.(more grindable ) You will see what I mean when you see it fully cured.

HTH
Duane

 

[simpsons7s]

Thanks for all the info guys. Hope to post pics of how it comes out.

 

[OfnaRcR4]

Buy some fibreglass matt, catalyst and some resin. Grind around the hole taking any gel/clear coating off as this will make the matt/resin stick to the bumper.

You will need

Catalyst
Resin
Matt (material)
Grinder
Brush/roller
Something to mix with

I would use some cardboard and put wax on it. This way when the matt dries, you can take it away without it sticking. You will need to use more than one layer of material. I would say use 2 layers on the 1" hole and maybe more on the larger one. This is all I can come up with without seeing it. After this is completed and dried, you can use filler to finish the part off

HTH
Duane

Exactly what he said is probally the best way.