Just for general interest, If your going to use a silicone sealer for the end seals, or anything else, a GREAT product is a GE Silicones primer, part number SS4004. It primes any surface and allows the silicone to adhear to the surface. We also use it on head/intake surfaces that have inprinted silicone gaskets. It really works great, but must be purchaced from a GE dealer/wholesaler direct. Cost is about $25.00 for a 16 oz bottle.