I can only get the reverse cap off... the obverse cap remains a challenge. I have placed a bookmark, obverse up, in a sunny window sill for about year now - it is turning yellow. I am hoping to get enough UV light degradation to have the cap come off... might take another year or two yet...
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
I did a loonie covered in the same stuff that came out of one of those credit card sized cards. Had to boil it longer than I expected and then suddenly it went soft and came off.
SPP, if you are able to remove the reverse cap, could you not just pry the obverse off? I guess the biggest challenge would be not damaging the proof finish. I would thing that if the plastic was soft enough that the coin could just be popped out.
For that proof loon, there are two different types of plastics used, for each side...
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
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