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Mold Making Tutorial Part 3

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Uploaded by on Apr 22, 2008

Instructional video about how to make a 2 part plaster mold. Part 3 of 3.

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Howto & Style

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Uploader Comments (animatorIsomer)

  • Great tutorial Ron! I was wondering how you didn't mention undercuts in your sculpture. You didn't seem worried about it a bit. Do you have tips on how to avoid (or not worry about) undercuts? FYI - I'm learning how to make molds for ceramics.

  • @mmm0109 The reason I didn't refer to undercuts is because undercuts are mostly a non-issue when you mold something in a soft material and will cast in a soft material as well. In both cases, you can remove the object being molded and cast without worrying so much about parts getting 'locked' in the mold. Undercuts are primarily an issue when the positive you're replicating, the mold and the casting are rigid. So long as the object being molded and the casting are flexible, it's not an issue.

  • That was great but how do U get the Foam Latex in the mold?

  • @Howyaduing - Either by stippling it in with a brush and pouring before closing the mold or by clamping the mold shut and injecting the foam with a large syringe. The mold I made in this tutorial cannot be injected into because that method requires that you put vents in the mold where it can be injected and vented out. I believe most people just use the stipples and pour method.

  • How do I pour the latex in then, do i paint a thin layer on then inject it, or just inject or pour it in? How long at what temperature should the latex be left? Roughly how many puppets/models could you make from one mould

  • @brennig2 Which kind of latex are you talking about? If you're using casting latex, temperature doesn't matter. Foam latex requires baking and the temperature depends upon the brand of foam latex you're using so, you'll need to follow the instructions that come with the kit.

    I don't know the limit on how many castings you can get out of an Ultracal 30 mold - at least 20 or 30 I would guess. And there is an additive called Acryl 60 you can add to it to make it last longer.

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  • Thanks. I've been looking for figure casting.

  • Yep very bloody useful stuff Ron.

  • Thank you very much for your series of videos on plaster molds, it has been really helpful, cheers.

  • Absolutely terrific tutorial. Perfect example on how its done. Thank you

  • very informative videos, thank you :)

  • Awesome video, thanks 4 sharing, good tutorial!!! i wanna do it right now!!!

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