There are some products available with glass fibers already mixed in. However, I have always prefered buying the chopped (usually called "milled", not "chopped") fiberglass separately and mixing it with the resin of my choice. That way you can completely control the viscosity of your mixed product. This is important for different applications at different temperatures. Also, and perhaps most important, the pre-mixed stuff that I have seen has been mixed with polyester or vinylester resin. And although I generally like the vinylester resins, I do not like polyester for structural repairs. For structural repair, epoxy is the best way to go. Vinylester is nice for smaller stuff (chips, dents, dings and scratches) especially if you are on a tight budget. Also, the chopped (milled) glass, when mixed thick with resin, can be a little difficult to work with and doesn`t always settle out smoothly. You would find it easier to use fumed silica or microballoons as your additive to the resin for filling voids. Then use straight resin and glass cloth to build up your repair.

Dave

Last edited by Captain_Dave; 06/20/05 06:28 PM.