i am painting my truck here soon and need to fix the rust on the back wheel wells and was wondering how i should do it? body panels bondo or other ideas? thanks

 

i used 18 gauge metal and a mig welder and just cut and bent and welded then grinded smooth and mixed bondo and got'r done and mine were bad then i got fender flares and u cant even look at my good work my friend has the 91 now. the thing i did to get the bend for the part right above the tire is i went to the other side and pressed it up and got a good idea of the shape

 

Use an old pair of front fenders for the radius and body lines.
Cut it all out and be sure to fix the inner piece that the outer skin attaches to, or you'll be doing it again in a short while.

I believe a right front fender will do a left rear wheel opening, and vice-versa.
People used to fix a lot of the pre-'81 trucks this way.

I save crashed fenders for this very reason, patch panels for the beds.

Mark.