Yes, you can do that.

Barry, what do you mean when you say "the bubbles are always at the top"? How fast is the kick time on your resin?

Smooth-On brand resins in general are kinda testy. If the mixing ratio is off by just a little bit, it can produce weird, inconsistent results in the final casting.

There are many different variations of each. However if you are referencing casting resins the main things we notice is urethanes are more moisture sensitive than epoxies and epoxies are more brittle than urethanes and epoxies smell worse than urethanes. Since controlling moisture is no big deal for us we prefer urethanes because they make more durable castings. Also we are able to get urethanes in faster setting options which allows us a quicker turnaround time on castings. Both work well for their intended purposes and we will use whichever fits the desired specs for the job.

@@IconPoly That's awsome thanks for the response!

Could you perhaps tell me what is the difference between pressure casting compared to vacuum casting of small parts? To me pressure casting looks way more simple..?

Did you vacuum the silicone when you made the mold? What shore hardness was your silicone?

I didn't vacuum, but i might have a go at pressuring the mould when i make a new one, just as an experiment. The shore strength is 28 i believe soft. I think the soft mould contorts under pressure.

You can try pressure casting the mold but we have not had very good success with that. Some silicones may not cure properly. Normally you would vacuum the mold and pressure cast the resin. We use 30A silicone so the 28 is not the problem.

Thanks for your reply, i will try some 30A, just a matter of experimentation.