I have a metal (aluminium?) awning porch that is leaking badly. It leaks just at the joints where the individual pieces join together. I think it is because someone walked on it to get to the roof. I am not sure how to fix this. I was told there is a special tape for this, but i would have to get up there, clean it some how and then apply the tape all without causing more damage to the awning. is there something that we can seal it with without having to walk on the awning? Thanks for any ideas.