You should remove as much of the original loose and dried caulking as possible. If there is any silicone caulking, it should all be removed. The area then should be cleaned and well dried. There are several sources of tapes that can be applied, as well as elastomeric products. As with any applied product, the proper surface preparation will ensure a long lasting repair.

The elastomeric products have a greater rate of expansion and contraction than most tapes. This is beneficial when dissimilar materials are joined together. I recently used this product on one of my trailers for this very reason. Some are also warrantied for as long as ten years.