- SORTA-Clear 37 - Addition Cure Silicone Rubber Compound - Gallon Unit

This stuff is like trying to mix slightly softened taffy. It's SO THICK!! It literally hurt my upper arms to mix for 3 mins. And you better be fast to pot this stuff cause it cured fast. If you dont have a vaccum chamber, you must have a pressure pot. You have to have one or the other to get rid of the bubbles. Both would be ideal because the pressure pot still didn't get rid of them all. Thankfully they weren't so bad they affected my dice.... looks like most of the bubbles were what got stuck on the surface. So do not buy thinking the fridge method will work. You cannot let this sit and hope it will degas on its own.Other than that, its SUPER clear, and sturdy. I will get many dice out of the molds.Recommendation: Mix, then immediately put in a vaccum chamber for 5 mins. Then immediately pour, then right into a pressure pot. Even pouring it, its so thick, makes more bubbles. But waaaaay less then pressure pot alone. And I had it up to 40 psi.Will buy again...when I have a vaccum chamber.

The silicon is great quality, you definitely get what you pay for but it is incredibly thick and because of both parts being the same color, its very hard to tell when fully mixed so you end up stirring this thing a ridiculous amount of time and switching hands every ten seconds as your wrist gets sore.However the end result is great, but if you don't need it to be clearish i would go with one of their cheaper opaque silicons since those also tend to be easier to mix.Because of the thickness it is also pretty impossible to pour in a thin strand but i was able to put mine in a pressure pot to relieve almost all the bubbles, the only ones i got settled where it was exposed to air while curing and not near the actual piece it was curing around. I saw someone say the pressure pot method wouldn't work but i tried it anyway and got excellent results. Maybe I just got lucky though so take it with a grain of salt

I used this to make molds for food applications. Mix 2 parts well - unlike colored resins, you can't see when the two parts are thoroughly mixed. Cures in a reasonably short period of time.

Pro tip: check the lot number first four digits. Month and year manufactured. The product I got was less than 2 months old (that's a good thing). Only thing I wish I had was a vacuumed chamber. This is rather viscus stuff so be ready. Ensure what you are casting/casting in is not going to react with the silicone. Once all those boxes are checked you should have zero issues. Smooth on products are awesome to work with and they have an amazing QC team if you end up with issues.

I bought this for an experiment. It worked well but would have worked much better if I had a vacuum chamber. It also takes a while to cure. It's a bit expensive but I don't expect to need much so it's not a big deal. Also, I will be able to get 2 molds from this one kit.Great detail and easy to use. Even for someone who has never done this before.

Great for resin dice making. Don’t use duct tape to create a barrier though. I didn’t cure well where it is in contact with that tape. It was sticky. I cut the edges off and it was fine. Not a flaw in the mold, just wanted to pass on some knowledge

Cures very tough and super clear providing a pressure pot or vacuum chamber was used. A little pricy for clear, but it's worth every penny. Only complaint is I wish I could find larger amounts of it.

Excelent silicone for our molds. It is nice to be able to see into the mold when doing multiple resin colors or patterns. We love each Smooth-on product we have tried out. This one is just right for our needs. No bad smell and mixing is easy.