material for making molds?

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switch62

Member
Joined
Jan 26, 2012
Messages
99
Location
Adelaide, Australia
In Australia we have Pinkysil (pink,soft and flexible), Ultrasil (blue and not as soft) and others from Barnes.

In the US have a look at Smooth-On they also have a lot of how-tos and videos.

Also have a look at ebay for RTV silicone. Don't know the quality of the ebay products.

What plastic will you be casting with? Make sure that the mold material is compatable. There are 2 types of RTV Silicone, Tin cure (condensation cure) and Platinum cure (addition cure). I think that PR needs Platinum cure otherwise the castings won't turn out properly, not sure about that.:confused:

TonyO
 

qballizhere

Member
Joined
Jan 31, 2011
Messages
330
Location
Northglenn Co
The pink stuff is made by smooth on and its called oomo 25, i believe or 30. I didnt care for it. I liked dragon skin 30 from smooth on. You can degas it but you dont have to. I have used it both ways.
 
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mredburn

IAP Activities Manager
Staff member
Joined
Jul 5, 2009
Messages
8,754
Location
Fort Myers FL
mold max in its different degrees from smooth on if you have a vacuum. I believe someone posted they have used it without degassing it in a vacuum.
 

crokett

Member
Joined
Dec 4, 2012
Messages
610
Location
Mebane, North Carolina
I have tried a couple different methods for molds in the last week. The two I made out of UHMW and cutting board both leaked, despite my best efforts to seal them. I am going to try making a form and mixing some setting-type drywall compound as the mold. I just need to figure out a release agent for it.
 
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