Dennis,
I have put a feeler out to someone who uses it, but a quick Goggle to the 3M site shows that most PSA's are acrylic based, as is MicroMark's. The other carriers were rubber and silicon. FYI, Sticky Notes use PSA to adhere, yet be moveable. I was thinking that once you paint your hull, the portholes should be fixed. Meanwhile, your ability to place and adjust would be much greater than with CA. I am thinking that you may have to add a fixer to your portholes after you are satisfied with their location, in order to avoid disrupting them when you handle your hull.