Fiberglass Mold over painted part

[wfd175]

Has anyone here ever made a fiberglass mold over a painted body part or object?

What would you suggest to protect the paint with to keep the resin from sticking to or etching the paint. I've done minor fiberglass repairs on boats, and other fiberglass objects.

I was thinking of the product they MAY use during the laying in of fibreglass to the regular boat hull templates. I'm not sure how they do that. Any information or source would be apprieciated.

 

[79fj40moneypit]

I have made fiberglas fenders for motorcycles and I use plastic wrap between the fender that I use as a mould and the glas buildup works great for my use.

There is a mould release in spray form that you may be able to find.

 

[Tools R Us]

The surface needs to be smooth and polished, then apply mold release. If your going to make the final part on this surface just lay it up and go.

If your making a mold to make other parts, the layup changes. First apply a thick gel coat to make the mold surface smooth and give you something to sand, polish if there are imperfections. Gel coat is the best, but have used thick primers, paint with good effect. The first couple of layers need to be fine cloth, much less chance of the glass weave showing through, then heavy mat to bulk, stiffen it up.

If the mold is going to be bigger than a few square inches it's best to make a framework from wood and glass it into the final layup. The frame will stiffen the mold and make it sit on the bench without rocking around when making parts.

Try Google there are a bunch of sites on this subject.

 

[tltaylor22]

If the mold is going to be bigger than a few square inches it's best to make a framework from wood and glass it into the final layup. The frame will stiffen the mold and make it sit on the bench without rocking around when making parts.

You can also create a sandwich by putting on several layers of glass and then spraying the surface or coating the surface with a dense foam, 1/2" thick. Then you cover that with several more layers of glass. We do this all the time. You can also you a resin cured clay intead of foam. This creates a very strong mold and will further limit the amount of print-through that any wood structure might cause.

We always put several coats of wax on the part to be pulled from and then spray that with a mold release. This will make the part pull very easily. Good luck.