Use High Strength 1, a tin-based silicone mold making rubber, when your mold requires a little more stiffness but still need exceptional tear strength.
Prior to using product, please read all Technical Data, Safety Data, and Instruction sheets linked below.
I have been using this product for over 5 years and it's always been perfect. However, the last two batches I received are not the same as usual. I purchased one batch in March 2021 but had to wait a couple of months before I could use it. It was very thick and hard to de-gas. I chalked it up to letting it sit around for too long. Ordered another batch a few weeks ago, and it is even worse! Four of the 11 molds I poured are ruined - and I only get one chance to make a mold. I compared it to my "older" batch, and this recent batch is even thicker. I've made 200+ molds using the product, so it is not operator error. Something is wrong with this product.
The stuff started to kick off faster than I had anticipated it would. So, degassing it did not work the best. Still, it worked out well. Just got to start using it now.