Aug 26, 2011 · Any concrete casting I've seen used polyurethane rubber molds, as it's tougher than silicone. Pricey though. I suppose you could build a negative form from wood, and pour …

Jun 6, 2012 · It is not from the molding process although some use alginate for the waste mold. Making an alginate mold of the helmet and letting it dry out a bit and then casting a part should …

Mar 27, 2006 · Clean the silicone mold with acetone or Ivory and water. Store it in the mother mold, dry and out of sunlight. It should last for years and give you many castings. Any mold …

Aug 28, 2013 · Concrete casting silicone would probably work best in this case (IIRC I think its about a shure 75A). Technically, if your casting silicone, you want a solid mould really. If your …

Mar 10, 2004 · If I understand you correctly, and you have a plaster mold and you want to cast something in it using polyester resin; them I would seal the plaster with a couple coats of spray …

May 6, 2018 · Alginate will work just fine on any clay. A mother mold with something like plaster bandage would be recommended. Just keep in mind that, because it's alginate, you're going to …

Feb 27, 2021 · If it's silicone, you often don't need a mold release. However if it's urethane rubber, then absolutely use a mold release. I am a fan of spray-on mold releases by companies like …

May 31, 2012 · I picked up something called Plastalina (by Van Aken) that is sulfur free. I'm looking at probably just one pull of a silicone mold and then make a mother. It seems like it's …

Jun 11, 2011 · Has anyone ever tried to squish some into a mold to make a "casting" with it? I have an idea bouncing around in my crazy wittle head, and thought this might be a cheap/easy …

Jul 16, 2020 · I have used both spray release and baby powder over the past several years. In my opinion, the baby powder does just as good a job of being a release agent as the spray …

Feb 24, 2008 · Not sure about the molding properties of the silicon-to-spackle connection. But I have used spackle as a filler because of how wel it smooths on, how cheap it is, and how easy …

Feb 16, 2016 · The mold was made by placing the cleaned printed piece, on a rolled flat piece of plasticine, shuttle boards were used to make mold walls. Using the newly created mold and …

Jul 3, 2011 · I've tried a reusable heated compound for the mold, but it's too hot and melts my oil based Monster Clay. I'd like to know if I can: 1) use plaster of paris (by Dap) to pour over the …

Nov 15, 2010 · I have added silicone to an old mold and it sticks, unless there is dust or anything in between. Try it, if it doesn't stick, try to plaster bandages to reinforce the silicone while it is …

Feb 12, 2008 · It's true that sulpher can play havoc with Platinum silicone, but your standard water clay (pottery clay) doesn't have any in it. The only time a molding material might have issues …

Oct 29, 2023 · Last night I saw that in the two plaster molds that I made has appeared green mold. My guess is from the humidity in the plaster. I haven't found anything about my problem …

Jul 24, 2012 · I recommend that you do a small test with your materials before you make your mold, it could save you the frustration of trying- vainly- to wash uncured silicone goop off of …