I found out the hard way once- tried finishing an older Bayliner with Meguiar's Cleaner Wax (auto) after running out of the boat version-
it took MAJOR EFFORT to remove the wax. Something that you'd think shouldn't happen, but it was brutal to remove.
A little gelcoat porosity could have been at play here, but it wasn't hard to remove the marine cleaner wax. Lesson learned.
Buzz