Smooth-On Mold Star 15 Slow - 1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit

I used this to mold ornate chess pieces and to make some cuppboard knobs in PU resin. It mixes simply and don't have to hurry (in fact I might look for a slightly faster version). I cast using a plastic cup and a paper cyclinder as a container and both worked fine and could be removed. neither of the masters (the resin chess pieces of wooden knobs) got stuck at all. The resulting mold has good, but flexibility but is fairly dense, the knob needed a split mold to get the bulbous part out. I cast with PU resin without any mold release spray and they came out of the mold easily and the level of detail was exceptional.

This is my favorite mold maker, it doesn't harden too fast, and honestly, even if I mixed it fast and saw many bubbles, no bubbles formed for my molds. Will buy again.

Mold Star 15 Slow has been fantastic for my projects. It captures fine detail really well and gives me consistent, bubble-free results. The longer working time is a huge plus when I need extra time to get everything just right. But what really stood out was the customer support. I reached out to Smooth-On directly to figure out which silicone would be best for what I was doing, and they walked me through everything step by step. Later, when I had some trouble with my mixing technique, they were super helpful and patient—totally saved me from wasting materials. Great product backed by a great team. Highly recommend it if you're getting into mold making or want something reliable with solid support behind it.

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I love this product, it’s brilliaht and easy to use. Although very messy, make sure you wear gloves. Just wish it wasn’t to expensive.