I used a twisted wire wheel on my die grinder. I took everything down to bare metal. Whenever I finished an area, I sprayed it with some primer to protect it. I had to replace my inner and outer cab corner. If you're planning on doing the same, do the inner first then the outer. I drilled holes and attached everything first with sheet metal screws before welding. Keep the screws in and put a couple of tack welds on the piece. If everything stills looks good and aligned, then use a couple of stitch welds. Run a 1/2"-1' weld @ every 6" to prevent warping. I let each stitch weld cool for about 2 minutes before going to the next weld. Continue stitch welding until complete. Then remove the screws and tack fill with weld. I didn't use a grinder to smooth out the welds afterwards. I used a sand paper flap disc on my die grinder. Hoped this helped. Have fun!
