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Brian D wrote:
I don't think that I've ever gotten a drip of epoxy falling off a pre-wetted chunk of fiberglass tape. Of course, by the time I started using that method, I'd gained enough glassing experience to know how much resin to put into it, but really ...the glass holds the epoxy quite well. Try it sometime 'cuz I think you'll like it. Another good way to pre-wet-out pieces of cloth is to use PVC sheet. It's commonly sold in varying thickness as painter's dropcloth. The .5 mil stuff is kinda flimsy but can be molded around 3-D shapes pretty well, the 3 mil stuff is pretty strong and I use it for wetting out pre-cut pieces on a flat bench or floor. It can be re-used almost infinitely too. Cured epoxy will not stick to it, makes a great barrier film. My method is to get a piece of the plastic sheeting that's at least twice as big as the fiberglass cloth I'm laminating, lay the cloth into one half of it, then add some mixed resin. Fold the other half of the sheet over, then roller it so that the resin gets spread eavenly thru the cloth and you don't get ick all over your hands or the roller. You can really get a great resin-glass ratio and handle the piece without fear of runs or drips. And isn't the concern over a drip here and there a bit like being concerned about getting wet when you go fishing? Be careful, but don't sweat the occasional drips and runs. Buy a 3" wide carbide scraper (with handle, and a knob above the business end) and the SurForm tool with the short handle and 2" by 1-1/2" (approx) curved cheese-grater on the end and you'll no longer sweat the little accidents ...they come off easily after curing and it's easy to leave a smooooth finish behind. Home Despot has these things for cheap and no epoxy user should be without them. Forget sandpaper for fixing drips and runs ...bad idea. Relax and enjoy the build. Or get a plastic putty knife and scrape up the dripping / running resin, take it over to your wet-out work area, and re-use it on the next piece of cloth. Economical and saves clean-up time. I've seen a heck of a lot of people working in fiberglass who seem to bring an unshakeable woodworker's mentality to the process.... make it thick, then cut it or sand it... then add some more and sand it off... etc etc. Shucks, the beauty of molding composites is that you can make it any shape you want, in less time, and make it *strong*. Get the material to work for you, not against you. Not that I'm an expert or anything, but I've made a lot of stuff out of epoxy resin added to various other materials... including carbon fiber... over the years. Fresh Breezes- Doug King |
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