I am trying to make a clear dome paperweight with an object suspended in it. I am using Alumilite Clear. I have been doing a few test runs and have had problems with a white discoloration where the layers meet.
Here is my workflow -
I start with a small pour to give a little space between the top of the paperweight and my object. I mix it the recommended way with a gram scale to make sure the ratio is correct, then let it cure in my pressure pot at 50psi for approx 8 hours. (this may be overkill for curing)
I then mix another batch and suspend the object, then the pressure pot for another 8 hours.
I am attaching a picture of the results, i'm not worried about the bubbles you can see - those are just on the top of the mold and will be sanded off. But every time I do it there is this clear line between the pour layers. When I open the pressure pot after the first mold the first layer is clear, you can't see any white on the surface of the pour.
I've searched through the threads and while I haven't found an answer to my exact scenario, there seems to be a few tips - heating the mold and first pour before the second, pouring while still tacky, but there are also just as many comments saying it should work without problem.
Does anyone have any advice on how to do this? Ideally i would like to do 3 pours to arrange the object, but am nervous because my object is one of a kind, so I don't want to ruin it.
I've seen this when mix ratios are off, but looks like you took care of that. The Alumilite Clear doesn't like to be poured in super small layers. I can't give can exact number, but I am sure it is floating around. The other thoughts would be the pennies were dirty and "contaminated" the epoxy. Moisture from wood can cause this issue a lot, although you are more likely to see the white at the surface of the wood rather than the whole pour. Perhaps try a thicker pour (like your first pour) and/or clean the pennies. Definitely keep experimenting! I am troubleshooting some different cases myself.
Smccusker1 is right, the Clears don't like very small layers but with where the line is on the casting I'm not sure if that was the problem. But dirty items would cause a problem. I know the pressure pot is recommended but I've never used one and I use Amazing Clear all the time without any problems. But you may be using the regular Clear, Amazing Clear and Clear are two different products and sometimes they do different things.