Hello Bob .. Welcome to the forum. Only death and rising taxes are permanent. I had a leaking seam. I used a wire brush in a side grinder to remove the old caulk. Then I used the same caulk Sundowner used. It is a polyurethane type material. Very tough ( I had to take the old stuff off) and flexible. I haven't had any leaks in 2 years. The caulk used is a moisture cured polyurethane. Manufactured by Sika Corp. 30800 Stephenson highway Madison Heights, MI 48071, 248-577-0020 The name is Sikaflex - 221 SF, Product code is 220-242 The color you'll want is "AL Gray" |