Silicone painting medium substitute for PSI-641?
I am going to be making some silicone puppets, and I watched the awesome tutorial about painting realistic flesh tones on silicone. I have looked online for the PSI-641 caulking that is recommended in the tutorial, but all the companies I have contacted have told me that it is discontinued. What other silicone can I use as a medium? Can I just use a little bit of the same catalysed silicone that I am pouring up the mold with?
Perhaps the thinning down instructions could be more specific and updated to usable materials.
We did end up using the catalyzed silicone (Gel 10) in this case thinned and through the airbrush easily and it held the pigment beautifully. I'm not sure if it was the cab o sil, or the silicone (we skipped both) but were able to to start immediately.
I used to work with Dow Corning 734 as well. I thinned all of them with D-limonene.
Hope it helps
If you are talking about the difference between GE1 and GE2 silicones, it is the cure method. GE1 is an acetoxy cure and releases acetic acid as a cure byproduct. GE2 is a neutral cure and releases methanol and ammonia as a byproduct.
The information above is partially correct but there are two types of RTV2 silicones. The two part silicones I mentioned above (which also includes a one part platinum silicone which cures with heat, used in dip molding) and also one part RTV2 silicones which are condensation cure silicones containing an organo-tin catalyst. Totally not confusing...
Here is a link explaining it better than I can: