Here's a first. I cast a septum from 5 min. epoxy. After checking on the mount after tucking the skin, I now notice the septum is cracked. There is a hairline crack in it. How can I hide it without losing the translucent effect of the epoxy and the texture from the cast?
And I don't know how I cracked the damn thing either...
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The reason it cracked is exoterm. It generates a lot of heat when it is curing - then while it's still hot - or as it cools - it cracks.
Fill it with a little more epoxy applid with a small toothpick or wire... sometimes gel cyanoacrylates (superglues) will work as well.
Get a different casting material with low exotherm and you'll avoid that in the future.
Exotherm... not term..
I talked to Steve at Newton Supply and he said the same things. It sure is exothermic, that stuff gets pretty hot when it sets up.