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Senior Member
Undisclosed Pod
yeah it looks a bit like plasticine!
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Plasticine?
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Some thoughts: it cures faster in the heat. I know I told you this already but very exact a:b measurements, is it hard anywhere ? Since it seems like it's gummy everywhere, I think it had to do with mixing or the air. Try a teensie test again and see if it cures this time
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I poured it in 78 degree weather and post cured it in the oven like it recommended. There's nowhere hard on it
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Could too much humidity affect it? I might try it indoors tomorrow
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Hmmm it could but that would make bubbles I think. Did the stuff in your cup or on your stir stick cure all the way?
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Nope but those were outside as well.
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My money is on slightly wrong measurements.... Or the cup maybe.
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The cup?
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Senior Member
Undisclosed Pod
Looks like moisture in your resin. Also, perhaps you didn't have accurate amounts, our maybe didn't mix it completely. The plastic will be flexible at first, but that looks way rubbery. Did you rush the demolding? I know it's hard to be patient. I'd recommend a layer of clay under everything, rather than the foil.
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Come to think of it, I rinsed out the mixing cup before I mixed the resin so there may have been some water left over in the cup. I waited an hour to demold, cure time is 30-40 minutes.
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idk i think moisture makes bubbles.
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New test mold. This is before and after 20 minutes. Going to give it an hour today before I pull it but it's already harder than my other mould. This was 1/2 tablespoon of each part
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Senior Member
Undisclosed Pod
I think you need to mix at least an ounce of resin to get the chemical reaction to fully happen.
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Actually I just demoulded this one and it turned out perfect! I'm not sure if it was the foil or moisture but it worked.
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Now what to line my mould box with...
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Senior Member
Undisclosed Pod
Probably not...In some Smooth-On how-tos, they advise baking the silicone in an oven to cure it faster and more completely! However, it can 'brown' the silicone. If you're painting it, it's not an issue.
(re mould box:I line everything with more clay!)
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Haha that's what I did with the mould box. It took forever
Annddd batch #1 of seaweed
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