Cowl repair

the only way to get rid of rust completley is to sandblast the affected areas this will also show you how bad things really are .or cut out the bad sections and weld in new or donor pieces por15 is great but only temporary and if you have gone this far already than go the whole way especially if you plan on keeping the car for along time believe me i have seen my share of rusty cars and replacing metal is far superior to temp fixes.hope this helps