I did 2 test fills before painting the desktop. As a result of test casting, I found that the mix I was using, a custom countertop versus a regular pre-packaged one, didn't make much of a difference. And that I suck like a crowbar. These tools helped me get the best edge and I'm happy with the result. The attached picture shows the final product, which doesn't use the largest, but the second or third largest ball.
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