Vacuum bagging
What it sounds like to me is the vacuum is degassing your epoxy.
To avoid this, place mixed epoxy (just use one container and mix thoroughly) in a vacuum chamber (an upside down glass cooking pot on a table top with a hole for the vacuum line) and pull a vacuum for a few minutes, say 5, to take out your air bubbles.
Now coat fiber on the mold and press resin into weave. Easy way to cover for vacuum is to use 2 part cover with a bead type seal. Smooth well, seal. Pull vacuum and let set. You SHOULD get little to no bubbles, no air left to outgas. Thats why prepreg works so well. Optimum concentration of resin and no air. Just remember, all vacuum baggin does is remove air for optimum resin penetration and supplies its own pressure for mold following.
Finish as before for shiny coat, or leave dull for racer look.
Larry
VFRrider
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