I think your idea of epoxy is is correct.
Acetone is inexpensive at the dollar store or at
Walmart in the Home and Beauty Dept.:


Yup - fingernail polish remover. Just make sure it says pure acetone and has no perfumes or colorings added.
I think the
Walmart bottle, last I bought it there, was around 2-2.50.
To head off some questions:
1. No, acetone its not toxic - our bodies even makesome and you small amounts every time you eat grapes.
2. Yes, "pure" acetone does have a bitterant added to it so that people will not drink it. However, the incredibly (understatement) small amount needed to be added to make the acetone bitter still allows the term "pure" to be applied.
3. IF used on pennies in direct sunlight and a long soak, acetone can make a pink coloring on the penny.
4. Other than point three, acetone cannot meddle with the metal!
5. Soaking time is when you are happy with the looks of the coin. Some things come off in seconds, some overnight.
I use a baby food jar b/c of its wider mouth and the cap will not let the acetone evaporate. You do not want the acetone to evaporate during the soak or the grime it takes off is imparted back onto the coin and I have yet to find a way to get it off.
Over the past years I have gone through quite a few of these (pictured) bottles of acetone with the coins showing no problems whatsoever.
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