It's been several years but I used some old stripper I had on hand from before the eco terrorists took over and ruined everything that works. It was still not easy. Took several days and about 6 or more applications. I wish I'd had my pressure washer then. I had it sealed up very well. The bubbly stuff came off fairly easily but the coating under was a different story. I ended up leaving some on and it turned out well. Only thing I've used lately is for and on wood cabinets. Pretty good, still took 3 coats, and a power wash. Klean strip premium stripper. I've heard about aircraft stripper, still don't know what it is. All else I've used from the box stores do nothing. Let us know what you find and the results. ..and welcome to the forum!