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I needed something to make good, detailed, 2-part molds for some small jewelry pieces I was casting in clear resin. After wasting money on some cheaper mold-making alternatives like Castin' Craft Mold Builder (took a WEEK to create a mold, and then didn't even work!) and Amazing Mold Putty (fine except for the cloudy, yellow film the mold left on my pieces), I finally shelled out the $27 for this at my local Dick Blick's. I wish I'd not been so cheap and had just gotten Oomoo in the first place, because it worked like a charm.
The two parts are easy to mix. Unlike resins, the Oomoo will cure just fine even if it's not a perfect 1:1 ratio, so if you don't have or don't want to dirty a measuring cup, it will still turn out fine even if you just eyeball the amounts of part "A" and "B" you pour. One thing I wish the Oomoo had is a more "pourable" opening--the goo tends to run down the sides, so keep tissue close at hand.
The instructions say to let the mold cure for 6 hours, but since I was using it for very small jewelry pieces, it was done in closer to 4-5 for me. Definitely make sure to invest in some mold release if you are doing a two-part mold; I used vaseline in a pinch, which worked okay, but I still had a bit of trouble separating it.
I cast some Castin' Craft clear resin inside the mold. I was pleased with how my piece cured. It was detailed and while not perfectly clear, it was MUCH better than it had been when I'd tried other molds. With a bit of shining and some glossy glaze applied to the outside, it was see-through. My only concern was that the resin tended to splash out along the "seam" of my mold. Although it stayed confined and didn't drip outside, I definitely felt better leaving the mold on top of a bit of plastic instead of straight on a tabletop. This did also leave a slight ridge around where the two pieces of the mold fit together. The excess resin was easy to peel off and with some slight scratching with my fingernail, I was able to make it less noticeable--but it is still there.
Bottom line: I would definitely recommend this for any kind of mold-making you need to do. Don't be put off by the fact it's twice the price as other mold makers or takes a little while longer to cure. It creates superior molds and is well worth the price.
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