Try a heat gun and go slow ....I use the smallest nozzle and cut 1/4 inch strips of an old catcher flap to use as glue / "solder"/ filler material. Heat the catcher in a small area at a time and heat until it just starts to get "shiny" then feed in 1/4 strip slowly . Takes a little practise but I've repaired fuel tanks successfully.
http://www.dewalt.com.au/powertools/productdetails/catno/D26414K/
