12-14-2010, 04:53 PM
(12-14-2010, 04:41 PM)THX1138 Wrote:(05-09-2010, 10:48 AM)427 Cobra Wrote: OK, Joe. This is what we're saying:
You can't pressurise the silicone as it's curing. ...
Unfortunately, many people claim they've done this without a problem, which is a lie!!! There's no way to pressurise silicone, as this would push a lot of the material out of the mould box, and onto the sides. ...
Just for reference purposes, this is false information. You can place a silicone mold under pressure while it's curing. I've done it many times, with good success. The process does not push the silicone out of your box. Gravity still works in a pressure pot.
Thanks Man, I will test the theory as soon as I start casting. I figure that Smoothon would know what their talking about. I'll do it on a small part and see what happens. I'll eventually have a Vac pump, so I can still vacuum degas. Just wanted to know if this would work. I figure if you can cast clear resin, by pressure casting. And get the bubbles down to invisible, it should work with rubber too. I'll be pressure casting most resin parts anyway, so it's not like the micro bubbles in the rubber mold can re expand. Cheers,
Joe