For those who have reached the place in your project of thinking about bodywork and rust, this might be a practical solution for the problem of pinholes.
Say you have a rusty fender with rust out. You can crank up the M.I.G. welder or T.I.G. welder and fill the pinholes up with new metal, but what if you don't have one? Find a welder that does,
and have him do it, or address it yourself. This is for the guy that wants to move his project forward but doesn't know how to weld.
First, look over the fender and locate those small holes, the rust holes; and this is important, with a small punch or a nail and a hammer, punch them out. Put a hole all the way through the metal. The reason for this is so you don't lose track of them once the paint and rust have been removed.
Next, get a medium-sized portable grinder and a wire wheel. The most efficient wheel I have found is from a welding supply store called a stringer bead brush, 4 or 5 inch. Safety glasses, face shield and hearing protection; of course, you know that part.
Next, remove the paint and rust; all of it. Front and back, top to bottom.
Next is the repair. Get one of those fiberglass repair kits from the hardware store and cut some small 1 or 2 inch patches from the cloth. On the underside of the fender apply the resin ( you did remove all the rust and paint right?), then the patch. After it dries add several more coats of resin. Dab that little hole on top of the fender with some resin and when it dries you have a good repair.
