Moldmaking Tutorial: How To Avoid Cure Inhibition With Platinum Silicones

In this tutorial we explain some common contaminates of Platinum Silicone and the importance of running a small test with new pattern materials and mold materials.
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[@kenengel620]

Certain paints can be dry yet not be done off-gassing. Those fumes can cause cure inhibition so give painted surfaces a bit of extra time to finish off-gassing after it's dry.

[@PeterK6502]

I made a mold yesterday from an acrylic piece which cost me multiple hours to make, and the result of the molding was a sticky mess. The leftovers did cure fine; only the surfaces in contact with the acrylic were affected. I searched the internet for answers, and I found this video which explains what happened.

[@bitymoldsupply]

Glad it was helpful!

[@burbosha]

Thank you for the clarification. This is very useful information.

[@bitymoldsupply]

Glad it was helpful!

[@wolfreicherter748]

top info

[@bitymoldsupply]

Thanks!

[@mrm8171]

I made a mold yesterday and used a hot glue gun to seal a few spots of the box and the silicone cleared beautifully other than where it came into contact with the dried glue

[@bitymoldsupply]

Yes! The old hot glue I would get at Hobby lobby never had issues but the stuff I’ve bought recently inhibited the silicone. I’m on the lookout for which hot glue is suspect. That will definitely be a future video topic.

[@mrm8171]

@bitymoldsupply I've used metallic duct-work tape to seal the seams in my boxes, and it works excellent!

[@jcarra3379]

How would you remove the uncured silicone from a resin print after it didn't fully cure?

[@bitymoldsupply]

Depends on what silicone you are using and what the print medium is.

[@dilarescobar4869]

So if the plasticine is sulfur based what can I do?

[@bitymoldsupply]

Mold it with our 5092 Tin Cure formula. I would still clear coat it and release it. It is also still a good idea to run a test just to make sure everything is going to cure properly. kzbin.info/www/bejne/npXWpYWgo718oLssi=UkSG-fCU_2l9NQOb

[@alexortiz4786]

Any recommendations for other silicone ? For 3d printed parts ?

[@bitymoldsupply]

Our 5092 sets over just about any surface. It is a Tin Cure formula that is almost impossible to contaminate.

[@alexortiz4786]

@@bitymoldsupply thank you !

[@augustdickerson7053]

If I have a mold I had run foam latex in, will I be able to do a silicone cast in the prosthetics mold?

[@bitymoldsupply]

Clean the mold with acetone first and then run a small test.

[@sokey70]

Do you use the EF or standard version of the Clear Guard?

[@bitymoldsupply]

For this test I used the regular, not the EF.

[@MoyaoftheMist]

I was working on that silicone baby doll project I’ve mentioned before… First batch in my mold did great, totally clean, but there were some bubbles I missed. When I tried to fill in the bubbles (by reusing the mold and first casting and filling the voids), I got a puddle of completely uncured goop all over the original casting. Now, given that my partner gave me the plastic spoons, I don’t know if they were brand new or washed in the dishwasher. I thought I had used the plastic cup brand for mixing before, but it was a new package… So I think I’ve narrowed it down to those two tools. But… how do I clean the ruined silicone off the mold and the doll and properly decontaminate both? I can seal the mold, but I need the silicone to adhere to the doll… Any tips? (You can ignore this next part because it’s midnight and I kinda went on a ramble. Sorry.) It’s so nasty and goopy. 😭 I think it must have been the mixing implements if only because the whole batch was like…clotted slime at best. I mean, thankfully it was a tiny batch (about 20ml to fill in the voids in my test mold), but I don’t want to scrap what I DID manage to make in the initial batch… (the mold was a mouth for a premade doll-gums, tongue, etc-because I wanted to start small but detailed in preparation for making a full custom baby doll. Also because I opened the baby’s mouth so it could suck its thumb or maybe a pacifier (not tested-wanted to avoid contamination), but then having a carved out maw kinda freaked me out.)

[@priyamtiwari5992]

awaiting reply to your question, one of my clay sculpture is also having uncured platinum grade silicone on it, want to clean it and start again... please help

[@bitymoldsupply]

There is a lot I would need to know to help you trouble shoot. Call us this next week! Thanks!

[@bitymoldsupply]

There is a lot that can cause inhibition. If you are working with our products feel free to call us during business hours and we can help you trouble shoot.

[@MoyaoftheMist]

@@bitymoldsupply All right, I’ll see if I can find a good time for that! I’m prepping for a trip this week, so it might be after the trip that I ring you up. Not sure.

[@christophergottlieb3886]

Would a mold release spray like silicone lubricant from Stanley cause cure inhibition with plat based silicones???

[@bitymoldsupply]

Silicone lubricant is very different from release agent. That said, you should not be using any silicone based release when making a silicone mold as you will either get a bond or cure inhibition.

[@ohbeatbox]

Are there any SLA resins that you know to not cause cure inhibitions with platinum silicone?

[@bitymoldsupply]

I have heard mixed reports on SLA resins. There are some that do not inhibit platinums and some that do. Hopefully we can compile a list of compatible resins at some point.