: I have also tried rice and onion skin papers. I was surprised when
: I found that the onion skin paper shows up in the background
: much more than the rice paper (and the rice paper is thicker)

There may be more problems with trapped
: bubbles on the overhead plastic sheets.

Here are photos of rice paper and onion skin paper. The Rice paper turned out to disappear better under the epoxy. Quite surprising since the rice paper was thicker and more opaque prior to adding the epoxy.