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woodelf> I guess you have two kinds of bubbles 1) Trapped air 2) woodelf> Voids in the filling. If you do the pouring in vacuum, and the viscosity is not excessive, you shouldn't have voids -- because those tend to come from trapped air and you get that in vacuum... (That assumes you got the bubbles out of the resin, of course. Same comment there: mix in vacuum? Then all you have left is reaction gases, which resins meant for casting shouldn't produce.) woodelf> I vacumm pump may be $$, but a woodelf> reversed air compressior pump or other hacked pump may work woodelf> since I don't think you need a strong vacumm. A water jet pump -- as found in old style chemistry labs -- produces a surprisingly good vacuum. It's very simple, no moving parts. You can find them in waterbed supply stores -- the widget used to empty waterbeds is one of these things. Rule of thumb for jet pumps: the minimum pressure achievable equals, roughly, the vapor pressure of the working fluid. paul