I'm given to understand that the difference in the composites and fiberglass is the cloth, not the resin. Assuming it's the same basic process, the pinholes are caused by one of a multitude of things like, inadiquaqte wax in the mould, too thin a gel coat, and too hot or too much catalist that causes heat and lets the styrene gas pool under the now soft gell coat. These are the precursors to what most airboaters call gators. Looks like gator skin.
It's nothing really serious but if you want to fix it its really simple. Assuming you havent waxed the prop. If you have, you have to wash out the pinhole with something that will remove any wax residue. After that you can try to clean out any foreign debree with a scribe or almost anything pointed. Dont try to dig to china just clean the surfaces inside the hole. Get yerself the following. Same colored gel coat, (tooling gel is best). Get some MEK-Peroxide, any color is fine but clear gives no clue to the mixture concentration when mixed. A popsicle stick, an artists paintbrush, and a roll of wide Scotch Tape.
Mix a little gell along with a drop of MEK in a small container, (follow mfrs instructions). Mix thoroughly. Take the artists brush and daub enough in the hole to fill it. Immediately cover with the Scotch Tape and let sit for a while. Clean up your mess with acitone. (Not on the prop) ! Acitone will clean the brush, your hands and whatever you mixed up the gell in. By now the gel should have reacted and set. When it has, peel off the tape and let it sit overnight. Then buff the surface til it all shines and is blended. If it isn't perfect, sometimes cursing will help, if that doesn't work sometimes you can violently kick the tires on the boat trailer, you can even insanely yell at the dog, but no kicking. He knows your FOS to begin with ! Failing that, have a beer and figure ya gave it a good shot. Now go run the boat and have another beer. OH, no BUI.........LOL
If my assumptions about the resin being the same are incorrect, and somebody can correct it please do so. Regardless, this kind of repair usually goes well with beer or for us nondrinkers, coffee. My above is generic to plastics repair.
Oh and to stop fiberglass itch when repairing/building.....go to the cheepest place around and get the cheepest cologne you can find and liberally wipe the itching area with it. It'll make it ease up for a while but nothing makes it go away but time. There ain't enough beer in the world to do that !
Scotty
