During the rains, the windows were sealed from the outside with plastic sheet and duct tape. It held well through wind-driven rain, no leaks. On the inside, during the layup, duct tape held the backing forms. Since I am too cheap to buy the expensive tape that supposedly doesn't leave residue, there was a lot of it.
On the outside, two weeks of sun reduced the residue to a powdery substance that came off easily with a scraper, followed by Goof-Off, then Acetone, then a little more sanding to ensure there was nothing left to cause the paint not to bond.
The inside was a different story. Protection from the sun left the residue so thick and gummy that a scraper was hopeless. The chemical 3M recommends for cleaning it off just made it giggle. I sat there thinking about it for a bit. Then it occurred to me: Fire!
I lit the small butane torch and quickly discovered that duct tape residue is quite flammable. The torch made it bubble and fizzle and smoke a lot, which converted it to a consistency that made scraping easy. The problem arrived when I didn't keep the scraper, which had built up a big ball of the stuff, far enough away from the flame. It went kerfluie! This in itself was not so bad, but the cabin overhead currently consists of naked polyethylene foam, which also wanted to participate. It took some lung power to get things back under control. I felt like Captain Jack Sparrow, blowing trying to put out the fire with each rotation after the restless natives had lashed him to the rotisserie spit. At least mine was above me and I could run.
All's well that ends well. The surfaces are clean and smooth, and after a little more bondo and a lot more sanding, the inside will be ready to accept paint as well.
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