I just finished stripping off about 10 layers of bottom paint. Underneath the paint is a greenish-yellow layer, that doesn't come off with the stripper, but will come off if scrubbed or sanded. I'm just curious what this layer is. I'm guessing its the original barrier coat but would appreciate any input. By the way, I used West Marine's version of peel-away. I had mixed results, but its still better than sanding. here's a few observations: 1. Don't use the plastic that comes with the product. Its virtually impossible to work with in even a light breeze. I used freezer paper, with the shiny side to the boat. Much easier to work with. 2. Put it on as thick as possible. Its a fine line between thick enough, and so thick it all drips off, but try to keep to the heavy side. 3. Try to avoid any air bubbles under the paper. these areas dry out and make scraping a lot tougher. 4. Don't kid yourself about it being "peel-away". Its peel-away the paper, then "scrape-away" the paint.