24 replies to this topic

[Paxamus]

mark poulson, on 17 February 2012 - 09:03 AM, said:

Thanks Paxamus.
I use Sculpey Clay to make my soft plastic masters, and I want to use it for my jig masters, too. Will that RTV work with Sculpey Clay?

Should be, I use normal old modeling clay and have forgot to use any lubricant or grease and still had the mold pull away without issues

[mark poulson]

Paxamus, on 17 February 2012 - 11:49 AM, said:

Should be, I use normal old modeling clay and have forgot to use any lubricant or grease and still had the mold pull away without issues

Thanks.

[jcool3]

Paxamus, on 17 February 2012 - 11:49 AM, said:

Should be, I use normal old modeling clay and have forgot to use any lubricant or grease and still had the mold pull away without issues

How thick do those silicone molds have to be. Can the molds be drilled - to get the pour holes and space for the hook. Looks like you back those molds with plywood, clamp, and pour the lead. Is that right?

[Paxamus]

The thickness should be somewhere around 1/4 to 1/2 inch from the maximum diameter just to ensure a long mold life. I use a razor knife, like an exacto knife or scalpel to cut pour holes and hook spaces. I have found that screwing a cut piece of plywood to both sides makes it easier to pour multiple molds at once. You don't have to attach a piece of wood but it does displace the pressure from a clamp so you get a better pour

[jcool3]

Paxamus, on 02 April 2012 - 03:08 PM, said:

The thickness should be somewhere around 1/4 to 1/2 inch from the maximum diameter just to ensure a long mold life. I use a razor knife, like an exacto knife or scalpel to cut pour holes and hook spaces. I have found that screwing a cut piece of plywood to both sides makes it easier to pour multiple molds at once. You don't have to attach a piece of wood but it does displace the pressure from a clamp so you get a better pour

thanks, sounds like silicone works way better than bondo i've been using.