Al..I used Polyester to glass tubes when I first started too..It is cheap and works OK..not sure by your post what your tryind to do..If your glassing tubes..here are a couple of tricks..you need to either "Peel Off" or sand off the Glasine layer off the tubes..this is the shiny outer layer..Polyester and or Epoxy will not soak into this layer..it's kind like it's water repelent..peeling is much easier them sanding..take a sharp knife or something and where the spiral stops at one end of the tube..you can pick at it till you can see that there are several layers that make up the tubes..get it started and slowly peel off the top layer..you can peel more layers if you want...don't worry about the fuzzy cardboard that your left with..the glassing will lay it all down..Like with anything..the more times you glass things the better you get at it..I wet out the cardboard and then lay the already cut glass on it..I support the body tube with a PVC pipe and then slowly role the glass on..You only need enoogh Polyester/Epoxy to wet out the fiberglass.. If your fiberglassing fins onto a body tube..you can check out this link..hopefully it will help..
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Tony