vacuum system repros

[Shedfreak88]

Have anyone herd or use some kind of vacuum system to product replicas. I found a website and it says they use fiberglass choppers and a vacuum system to make thier molds. can anyone explain to me what that is?

[jermh1]

If you pour your mold you need a vacuum chamber to degass the rubber, and if you use a slow set plastic you can degass that also to eliminate air bubbles, and also there is a vacuum bagging system which a mold is places in a bag with resin and cloth or chopped strands, with a porous  plastic over the glass (peel ply), then a bleeder/breather (like thick felt), then the bag. the vacuum bagging method for glass layup kicks ass if you can get it to work for your application, no need to work all the resin in to each layer, just slap everything together, put the layers on it, bag it up,  turn on the pump, wait till it sets, and your castings are super light weight, strong and more flexable.
Jeremy