Micro Mark's Silicone Putty for MoldMaking. Anyone tried it?

[Treadhead]

This looks like more putty than rubber. Looks convenient enough, but was wondering if anyone had used it.

Silicone Putty (MicroMark)

[macfrank]

This looks like more putty than rubber. Looks convenient enough, but was wondering if anyone had used it.

Silicone Putty (MicroMark)

I've tried it. It's a polyvinyl siloxane impression material that's used by dentists, and it's one of my favorite mold materials, especially in the lower viscosity versions. It comes in several viscosities, all are 1:1 mixes and all cure in minutes. You don't really need a mold walls in any but the runniest of them.

The MicroMark putty is the highest viscosity version, and it does a fair job of reproducing fine details. It's not suitable for delicate parts, since you have to squeeze the material in to get into the smallest details - mixed, it has a consisteny between well chewed chewing gum and silly putty.

Make sure you mix equal amounts, and remember that you have a short working time, so have the master ready to go. With this material, I break off a small ball and squish it into the areas with the highest detail. I then glob on the rest.

The main thing to watch out for is the expiration date. If your version is within a month or two of the expiration date (it should be listed on the container) send it back. Once the material ages, the silicone oil starts to ooze out and it's hard to make a good impression with the mixed material.

Frank