>My nominal work involved
> on a 5.5 or 7.5 diam tube involves a layer of 6oz glass. Light sanding
> just to get the bumps off. Then a layer of 3oz cloth, again light
> sanding. Then fill and finish and sand that stuff to eliminate any
> imperfections. Then a layer of 1.5 oz cloth and I figure I sand half of
> that layer away to get a "glass" smooth finish.
-- Life will be easier and bonds better if you use a peel-ply between
layers instead of sanding. A light sanding will give a poor bond, all of
the thin wax that allows the epoxy to achieve a full cure (even down in
the dips) must be removed (or use a laminating epoxy without the wax).
Never fill between laminations. Also, never sand into the glass, only
the epoxy. Butter the last lamination, after removing the peel-ply, with
micro-ballooned epoxy, and only sand through that.
Lighter, stronger, faster, less sanding.
Perspective is everything