Mold Making with 74-30 Rubber

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Uploaded by on Jul 16, 2009

Here's a quick quide to making brush on molds with 74-30 urethane rubber. 7430 is a great general purpose rubber that is great for casting plaster, wax, or Gel-10 silicone. You can thicken 74-30 rubber with Cab-o-sil or PolyFiber for brush-on mold applications.

These molds were made over TexClay positives. Texclay is a meltable clay that may be poured directly into alginate to produce a sculptable positive.

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Uploader Comments (brickintheyard)

  • Hi bity! LOVE your products! just wondering: I want to make a 2 piece mold with 74-30, what would I use as a separator?

  • @artnouveauiswar Thanks! Use 2300 Spray Release.

  • the poly 74/75 x catalyst is not on your online store and how much would it cost to order it if you have it

  • @melissa19947 It is ~$14 for a 4oz bottle. Call our store to order it. There is a lot of stuff that we carry in our physical store that is not available online.

  • how do you release nsp chavant clay from 74 30

  • @melissa19947 A light spray of 2300 mold release.

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All Comments (33)

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  • @Eidejak 6-8 lbs.

  • How many pounds would you estimate it would take to make a half inch thick clay cast of the head and shoulders? Thank you for the videos, they have been really helpful.

  • @peaceINDIAnPAK These head molds took about 3-4 lbs of rubber each. Our store is in Dallas Tx.

  • how much would that weigh? and where is ur store?

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