Can u add a 2 nd layer if Doing a deep pour. I had some leak out. How much time before it is too late to add another layer? Txs
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The question of whether a 2nd pour would create a casting that's cohesive with the first (and how much later that pour can happen) depends on WHAT you're pouring, and also on what you're casting.
I was making big ingot of Alumilite RC-3 (think of a half-full 5-gallon bucket) for a machinist to put on a lathe. I did a 2nd pour after I found out he needed some added headroom to mount the ingot to the lathe. So before pouring more, I drilled a bunch of fat angled holes in the surface so the new plastic would have mechanical engagement with the old. That worked out.
I've poured Alumilite resin into silicone molds enough times that I have run out of mixture a few times. I've found that the silicone mold must have distorted at the meniscus of the 1st pour, because the finished piece had a ring of very slight distortion all the way around it at that level.