Give PRS a call... Private Stock guitars are very specifically constructed, so they will know exactly which finish went on your guitar, and can tell you the characteristics of that formulation, including how it is expected to age. They do have a nitro formulation that is intended to crack/check over time, but the only way to know if that was used on your instrument is to call them with your PS number and ask. That’s the “for sure” way to know.

Congratulations on your PS!
 
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