making molds

[lunker05]

What can you use to pour into an existing mold that will harden to make a master copy so you could take that and pour around it to make duplicate molds out of rtv.

[nickcalderone]

I would try "casting reisin"...available at most hobby stores.

[wrm-n]

I bought some POP mold from Chris on ebay. I will try to explain this the best I can. I put one of the molds face up into a foil baking pan (the ones you buy 3 for about a $1.00). I took the plastic I pour with ( old stuff that I goofed up with) and added a lot of hardener. Got it up to temp. and poured it over the mold. Let it cool.... popped the mold out... one master. I am going to take pictures and post them.... I hope.

#1 mold in the pan

#2 pour plastic with lots of hardener

#3 the mold in the plastic after it cooled

The master and new mold I made from it. No sanding or touch up on the new molds

Sorry Chris! 8 mold just wasn't enough to pour through. LOL

But I do like it...great little worm

[longhorn]

I use worm plastic for most of my masters...also have used canning wax for some...it will release from an rtv mold but not POP. If the existing mold us POP I'd use plastic. Canning wax can also be carved for use as a master in a POP mold. Another thing I've done before is use play doh id the mold is really simple...you can press it in the cavity and carefully remove it...but if the mold has a lot of detail probably not too good. I like the idea above about overpouring the whole thing...great idea and good looking mold.