Plexiglas/ Lexan

Bad idea in my opinion. You appear to categorize Plexiglas and Lexan as if they are the same thing. They are not. Quite dissimilar chemicals are used in the creation of each and the oils and residues from one will deteriorate your notes at a rate faster than the other. One also has a much greater stress factor than the other. I do not recall which is which, but there are most definitely differences between the two. I would recommend that you do a little research into what rigid, yet transparent materials may be safe to store paper documents in and which are not.

There existed at one time a product called the 'Capitol Note Holder' and was very much similar to what you describe, and I believe that I read that it safeguarded notes for very extended amounts of time. It's chemical makeup is unknown to me.

As for using a sealant around the edge of your holder, I would be very hesitant to even consider such a thing, due to the seepage possibility as well as the chance of locked in vapors that could damage the note.

King Farouk of Egypt (in the 1950s) assembled one of the most extensive collections of banknotes on the planet, many of which were very rare, and highly prized US notes. All notes were ruined when he had them laminated in his quest for preservation (without consultation).

Thanks for the info. Fortunately I have not used any sealants yet and I did not think about the vapors. And as for the screw base ball holders I will research those who know maybe I can make a similar item for paper money/currency. By the way my son and granddaughter gave me class on these forum listings I hope I am doing this properly. umm back to the subject I guess I have some more research to do and thanks for the current information