Where the front fenders bolt down to the inner fenders or the engine bay, there is a black putty like sealer. What is this? Also around the fuel tank in the trunk seams to be a putty type sealer. Should this all be removed and then replaced? if so with what? I am jumping the gun as I am not at this point yet but am gathering a good deal of info so that when i get there i will already know what to do.