Paint stripper damage

Had a relative that had this happen on a Piper Cheyenne that he got
painted at a cheap paint shop. At about 23K the capt's side window
blew out and he half departed the window along with a passenger's
briefcase.

If the damage is deep and thin it will be a stress riser. Not such a
huge issue on an unpressurised plane, but something to be concerned
about anyway. Mutch etching at all and I'd replace them.