[QUOTE=skyking;291010]
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In the past, it took several fill coats and sanding or expensive vacuum bagging gear to get a smooth layup.
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A related technique, used with epoxy, is covering the layup with peel ply, which can be formed into a compound curve. This leaves a surface that permits secondary bonding without the need for sanding. But it also permits light sanding, in preparation for painting, without getting down to the glass. Sanding with 150 grit, then using a high fill primer and one sanding of that is usually enough prep for finish painting.
Bubbles might be a little easier to work out of peel ply. Both techniques can be useful for different conditions. (Peel ply replaces the fiberglass fabric weave surface with a much finer dacron weave, which is not glossy.)