My initial feedback is that the stuff is excellent. A real money saver for me as the leaking roof on my 1985 Coachman was making the RV nearly unusable. It did thicken a bit faster than I thought, and it hasn’t rained on the roof yet, so my glowing review is only preliminary. So, at this point your product is batting a thousand. My motorhome is 23′ long and +/- 10′ wide, but one gallon nearly covered the entire roof, which was leaking like a head wound. I’ll take a few pics of the uncovered portion and the covered end, then send them to you. The product may have added years of life to a very old RV.