What size does this make

This kit will yield 51.2 cubic inches of material.

what's the difference between this mold star and the 16 fast?

This version has no color - it is cloudy clear.

Will different silicones stick together when making a mold? I ran out so part of my mold is cured?

You should be fine with using other silicones if you use a silicone release spray when you create your mold. Something like "Smooth-On Universal Mold Release" would be sufficient.

Been wanting to try this. Is there a step by step tutorial before I buy it ?

Yes, if your looking for tutorial videos, go to https://www.smooth-on.com/tutorials/ to learn about the many different mold making techniques.

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⚡ Mold like a pro, cast like a boss!

RAPID TURNAROUND - Demold your creations in just 30 minutes—speed up your prototyping workflow.
DURABLE TEAR RESISTANT - Soft yet strong silicone rubber that withstands repeated use without cracking or shrinking.
HEAT RESISTANT RELIABILITY - Withstands temperatures up to 450°F, ideal for demanding casting projects.
EFFORTLESS PRECISION MIXING - Mix 1A:1B by volume—no weighing scale required, saving you time and hassle.
VERSATILE CASTING COMPATIBILITY - Perfect for wax, gypsum, resins, concrete, and even low-temp metal alloys.

Smooth-On Mould Star 20T is a translucent platinum-cure silicone rubber with a user-friendly 1:1 volume mix ratio. It cures quickly to a soft, tear-resistant mold with low shrinkage, heat resistance up to 450°F, and broad compatibility with casting materials—perfect for professionals seeking durable, fast, and versatile mold-making solutions.

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