05-04-2010, 02:41 PM
I say yes. Im still a learner but have been taught by a couple of very good modellers some tricks & watched alot of Youtube videos but the best information & tutorials I got from http://www.smoothon.com Check them out & their tutorials. Their tops. So anyway the vaccuuming of the rubber takes out the bubbles in the air in the rubber so when your mould cures you don't have any holes, pits or bubbles that will give you a poor casting. It helps make the rubber as smooth as possible to give you an exact reproduction of what your moulding. If you don't do it your mould will probably get these pits etc in it & result in poor castings. Thats the simplest explination I can offer. If you want quality moulds that will last longer then its important to spend the money on the equipment. This will save you monmey in the long run. Pressuriseing when casting only takes the bubbles out of the resin by pushing the air to the breather lines. If there are bubbles & pits in your mould the pressuriseing will just accentuate those defects.