What to do for a rusting firewall?

[1981CJ5]

During my blazer blower upgrade, I discovered that my firewall needs attention. Is there a cure besides a new body? It is only in certain spots, like around the heater drain and blower motor. Any help?

 

[far_right]

if you can weld, or if you cant find some one who can, and cut out all the old rusting metal, weld in new sheet metal and then paint

 

[Tug-n-pull]

cutting out the rust and new metal is the only true cure for rust. Like Far Right said. Just going t be a bear to get to but will be worth it if you plan to keep it. tug