That does seem like a better option, if only to eliminate the nuisance of removing the plastic.
If it gets hot enough to cause trouble with the mylar I doubt much would survive. If I remember right mylar gets bad around 800.
I saw really mixed stuff about leather and heat. And of course, that was all about regular leather.
If baseballs were cheap enough I might try doing one cubed and one not at fairly high temps for a long time, checking every hour or so. Maybe once flea market season starts back up and I can find them for a buck each or less.
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