Fast curing RTV- What's it called?

[Stu Pidasso]

I ran across this item, and I'm wondering what this stuff is called (Scroll down to almost the bottom to just below the 1:1 mix RTV) It looks like play dough, and you knead it together, and in 5 minutes, you have an RTV silicone mold. I need to do a one part gang mold of 10 tiny pieces of resin, but only one master. This would really save me time if I could just smoosh the same piece in the putty 10 times, then let it cure, since it's not liquid.

Any help from the veterans? Would this be worth the investment, or can I go cheaper at Autozone?

What about Mighty Putty?

[DennisH]

Ask and yeeeeeeee shall receive.

http://www.silpak.com/products/?page=sh ... 2fd630749c

HTH



Dennis

[macfrank]

I've used a type of silicone putty (polyvinyl siloxane) that's used by dentists to make teeth molds. The stuff is a 1:1 mix and you have a few minutes working time before it cures.

They have two problems, compared to regular RTVs:

1 - cost (although the John Greer stuff looks good, and so does Amazing Mold Putty

2 - quality of reproduction. The lower viscosity putties (they're like thick maple syrup) will make a good reproduction of the original, but the finer details won't be as good as a very thin RTV mold material. The thicker stuff (like the Amazing Putty) will be worse. If your master has relatively few fine details either one will be fine.

They are otherwise great if you need a quick copy of a part, since the mold will be ready to use in a little over 5 minutes for the siloxane and in the thicker stuff (like the putty) you won't need a mold. The finished mold is pretty durable; I have some siloxane molds that are 8 years old and they're still flexible and usable.

Frank

[TER-OR]

There's also Knead-a-mold, available at Michaels.
If you don't need too much it's a good option.

[davidlgreen]

there is also castaldo quick-sil which i have used successfully.
castaldo.com