It would be critically important to make sure that you use the right product and not something like roofing tar that also comes in caulking tubes. I notice that this stuff is a polyurethane product. Cleaning the surfaces will be real important too because tires are coated with mould releasing agents when they are manufactured and tire shops often use a vegetable soap compund for mounting tires, both of which will make good adhesion of the polyurethane less likely.

If the job is done right It will be interesting to see how hard (or not) it will be to take the tire off the rim later. <img src="/forums/images/graemlins/notooth.gif" alt="" /> -- Matt