Think about this, What sticks to a prepped metal surface the best?
Answer: Body filler
Prep both surfaces with 36 grit sandpaper and bond the 2 pieces (firewall & patch) together, let body filler harden and sand smooth.


1950 Chevy p\u 3100. lt1 Corvette powered.
Owner\ autoglass unlimited/Ultra Clear Body Shield
Cowboys creo: taste your words before you spit them out
http://s202.photobucket.com/albums/aa180/getm24_2000/