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Been casting some stuff and had an issue with bubbles in the resin. Could it be from old resin? I'm finishing the two bottles from an old kit and wondering if I'm doing something I wasn't before or if it's something I'm not in control of like old stuff. I haven't cast in about 4 - 5 months so it's not extremely old. I had no issues with these two bottles previously, and the bubbles are clearly visible in the pour and not consistent in location so I know it's not the mold itself. Just looking to the experts for their input before trashing the old stuff. Thanks Chuck
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It's not a doll it's an action figure. -
Was it humid out? that can cause sort of like foaming bubbles in the resin.
WANTED: Removable Mask ROBIN on Kresge style card -
I've had issue with old resin before, but 4-5 months isn't that old. I've had issue both with humidity as Mike said, as well as cold. In the winter (since my garage isn't heated) I bring the materials inside the house and cast indoors. I'll also heat up the molds in the microwave. Warm molds help alot.Comment
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It definately wasn't cold though it was in my shop in the basement. I have had water issues years ago though nothing recently and do not run my dehumidifier at all anymore. I guess that may have been the issue even though I didn't notice it as being humid or damp. It was definately noticable in the resin before I poured them. It was full of tiny bubbles, and not the good Don Ho type. Caused some serious pitting and needed hefty sanding to alleviate the problem with the casts. I'm not too worried about the age of the resin before I bought it as I get it straight from a Smooth-On factory store in Boston and they do a pretty good amount of business, so their stuff is constantly rotated. I've actually been quite impressed the two times I've been there to get product. Very organized and knowledgable about anything I've asked. Why would I not use mold release with my silicone molds? I always have with no bad results. I use the ease release from Smooth-On. Thanks for the answers. Maybe I'll try casting upstairs and see if it makes a difference. CGIt's not a doll it's an action figure.Comment
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Hmmmm....
Try a thin coating of baby powder in the mold before you cast.
Don C.Comment
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It's an issue before pouring not with the extraction of the finished piece. The bubbles are clearly visible in the mixed resin, more so than ever before. I'm guessing the humidity factor may be the reason and hopefully casting in a different location will solve the problem. Thanks for all the replies. Now if I can just get some more time to actually devote to my hobby I'll be all set and see if it resolves the issue.
It's not a doll it's an action figure.Comment
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when pouring plasters and other materials into molds at one job I worked at. we would place the entire mold in a vacuum box to remove these bubbles year round. Our vac box was an old mini fridge with a hole cut in the top and pvc piping bolted and silocone sealed. We popped in the mold. closed the door. (Fridge doors have that great seal.) and turn on the shop vac for a few minutes. The plumbing PVC piping came in a size that seemed to be made for our shop vac. The negitive pressure pulled those little bubbles right out of the soup. (As it was called in the shop.) Yeah just dont ask what job that was OK.Comment
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