I wonder if anyone has tried using FlexSeal instead of the 3M stuff to seal the rim? Should work, right? Also, did you have to be careful around where the stem goes through? I got everything I think I'll need for the rear, since putting on a car tire (bike is not going to lean, since have Voyager-type kit on the back, making it like a trike). Had given the bike to a friend with stage 4 liver cancer, and he added the kit so he could ride with us, and then passed last year, and his wife recently gave us back the bike, with the kit on it. Wife has always wanted a trike, so thought I would leave it that way for her, but wanted better traction on the back, and cheaper tires that last longer, too. Figured I'd just seal the rim, like this, and install the car tire. I already have another tire for the front, too, but with tube and rim strip. Just need to find a shop that will install them.