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Topic: Easy Cast Resin Looking "Frosted" when cast in Amazing Putty Molds  (Read 1580 times)
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ceruleanfalcon
« on: March 25, 2011 06:28:18 AM »

I've done a couple of resin casts using Easy Cast Resin in molds made from Amazing Mold Putty... 

They keep coming out with a "frosted" look.. That's fine for the ones I plan to paint, but there are some I wanted to keep clear and so...

Does anyone know if just getting a certain Mold Release or doing something else will help this?  I followed the instructions on the packaging regarding 'stirring two minutes, move to new cup, stir additional minute with new stick', etc. as perfectly as I could..and the backs of the pieces -are- clear, so I really think it's something to do with the Mold Putty..

Has anyone else worked with both of these brands and been able to get clear casts?  (If so, what did you do!?)

Thank you so much for any and all help!!  I really appreciate it!!

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blackie.sage
« Reply #1 on: March 25, 2011 11:44:01 AM »

I had the same problem when I made molds out of "ogoo" (a mixture of silicone caulk and corn starch).

At first I just thought it was because I hadn't sanded the item I made the mold out of well enough, or that I hadn't left the resin in the mold long enough, but after reading this I too would like to learn some more about fixing this problem. Good thing I didn't get any of that putty when I ordered molds yesterday!
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Diane B.
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« Reply #2 on: March 26, 2011 10:09:28 AM »

The brand of 2-part silicone mold material callled Amazing Mold Putty won't cure with a completely smooth surface (you'd have to look with a magnifying glass to see that though) so even that tiny amount of roughness can transfer itself to the cast resin making it look frosty (sort of similar to using ice cube trays as molds which have microscopic scratches after having been wiped out rather than allowed to air-dry over time).

Some other brands will work much better but generally those won't be available at craft stores like Amazing Mold Putty.  Two very good ones for example ae Miracle Mold and Alley Goop.
You can read about many of the brands, etc., on this page at my site:
http://glassattic.com/polymer/molds.htm > 2-Part Silicone Putties 

At this point you can make the surface clear again by coating it with a layer of epoxy resin or you could probably do the same with a clear gloss (water-based) polyurethane since those will fill in all the tiny scratches (one good brand of polyurethane btw is Varathane--indoor, Gloss version--from many hardware stores). 
Sanding and buffing would work some but my understanding is that doing that will never bring back quite the level of gloss that resin should have.
If you're interested in more info/lessons/etc re resins (epoxy, tweaked epoxy like Easy Cast, and polyester), also check out this page at my site:
http://glassattic.com/polymer/other_materials.htm

HTH,
Diane B.
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ceruleanfalcon
« Reply #3 on: March 27, 2011 01:56:28 PM »

Ah - that answers my questions perfectly.. Thank you so much! : )

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