I know it has been used on boats, don't know how well it performs below the water line. Recall someone from maritime part of N. America said boat shops normal prep cleaning for painting
will not remove it. Common enough that it's known in the marine industry.
Removal for general use is not too bad. Ammonia and water removes floor wax, manufacturer makes remover that people have used with good results on campers. Someone discovered (by accident) that the coin operated car wash tire/whitewall cleaner removes it also.
If having someone prep for fiberglass work or painting
be sure to make them aware that this type of wax has been used, because it is tougher than most waxes and thin enough to get into pits, prep cleaning appropriate to this product is required.
Any wax or polish carries this issue of prep cleaning but making the shop aware of the specific product they have to clean before getting a quote or the work done is on you. Wax contamination of any kind ruins new paint
job, and bond of fiberglass work.
I should add if your going to add decals / stripes or have painting
done on camper or boat wait until after that work to use any wax, you just making work for yourself otherwise.