I hate giving this type of answer, but....
It depends. A high gloss varnish or shellac could absorb some under the coating and start peeling. An "oiled" stock may be no problem.
I would suggest that you find a small area that is not readily seen and try a dab.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
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Former President of the ECPT (Eifel Combat Pistol Team)