Need Help with Silicone Rubber NOT CURING
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Need Help with Silicone Rubber NOT CURING

Posted in Custom Workstation

Hi everyone,

I just tried to make my first Silicone Rubber mold, and long story short: IT Won't CURE!!
I don't know if have something to do with the batch (is about 3 years old), the point is that for over two days now, I have 4 Heads submerged in Silicon Rubber that has the consistence of melted Velveeta cheese!!!
Please, can somebody give me a hint on how to help the curing process or in the worst case how to clean up the heads?
For reference I used Alumilite's High Strength 2.

Posted by IC Customs International
on Wednesday, June 12, 2013
User Comments
Green Skin -
Thursday, June 13, 2013
Assuming you got the AB proportions correct I think your problem is how old the product is. The shelf life for silicone mold rubber is only 6 months according the the Alumilite website. I've gone beyond that shelf life plenty of times without issues, but 3 years is pushing it a bit.
pock63 -
Thursday, June 13, 2013
I use the same stuff and provided you had the proportions of part A and B the same as shown in the instructions than I would say it was a problem with the batch, you could try heating the molds up in the oven at a safe temp that won't melt the heads like 130 degree's because heat speeds up chemical reactions(I sometimes do this with my molds when I don't want to wait a day for them to cure). If that doesn't work then I would clean the heads with hot water that has lots of soap in it, and if the heads are from your fodder box and are going to be repainted anyway I would add a small amount of finger nail polish remover to the mix(which may strip the paint but will also help with cleaning them).
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