On the question of strippers, I used Aircraft Stripper from
AutoZone. I used both the cans of toxic gue and the spray on cans.
I found that the spray on was particularily good to use on the top curved panels and the roof. (hard to reach areas) Those surfaces I washed down the hose.
On the vertical surfaces I was more inclined (ha ha) to use the
toxic gue. I poured it into an old small can and swabbed it on with a 4" paint brush. (Smaller brushes in tight spots).
After waiting for appropriate bubbling to occur (varies by temp, age, and condition of clear coat) I would brush downward with another large brush and then follow up with numerous terry cloth towels, ... at times this had to be repeated till all signs of clear coat were gone. Again rinsed it all.
My "original" Waterproofing included window glazing, silicone,
other unknown yucky stuff, and 35 year old vulkem.
Anything that the stripper didn't remove, I have had to remove
and re-vulkem anyway.