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Vacuum Seal Bag removes air bubbles from RTV molds & castings
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If you ever tried casting your own parts you know about air bubbles. I was planning on doing some parts casting and I had read that a one fella made a pressure vessel from painters spray equipment. Having experience problems with air bubbles from previous casting adventures, I looked into making a pressure vessel. Making one would be expensive. <br /> <br /> While channel surfing on the TV, I came across an "infomercial" for Vacuum Seal Bags. I figured for $20 I'd have vacuum bags I could use around the house if it didn't work for mold making. <br /> Well it works great. You have to put a board or something on top and sides of the mold box to keep the bag from touching the wet RTV. <br /> When I hooked up the bag to the shop vac, those air bubbles came out fast, almost instantly. I kept it under vacuum until the RTV cured. <br /> <br /> NOTE: Be sure your master pattern is well attached to the mold base so it will not float in the RTV. I use rubber cement to hold the pattern down. It holds good and is easy to remove. <br /> <br />[img]http://img.villagephotos.com/p/2006-2/1148725/vacbag.jpg[/img]
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