If you prepare the surface of your rust repair patch panel correctly, the repair will not fail. This video shows how to knock down your seams, fill, and finish the job.
Tools and materials listed below:
*** 5" Sander/Grinder: Astro Pneumatic 5" High Speed Air Sander 222S
*** 36 Grit 5" Disc: 36 grit discs cut down after use on 7" larger sander/grinder - https://benchmarkabrasives.com/collections/aluminum-oxide-resin-fiber-discs/products/7-x-7-8-aluminum-oxide-resin-fiber-disc-25-pac
*** Speed Blaster: Sand Blaster - https://www.amazon.com/SpeedBlaster-Gravity-Feed-Media-Blaster/dp/B000IHUQ5E/ref=asc_df_B000IHUQ5E/?tag=hyprod-20&linkCode=df0&hvadid
*** Sand Blasting Media: Medium or Fine works - https://www.tractorsupply.com/tsc/product/black-diamond-medium-blasting-abrasives?cm_vc=-10005
*** Body Hammer - https://www.autobodytoolmart.com/product/martin-general-purpose-pick-hammers/martin-tools - The hammer in the video was made on a metal lathe.
*** Dolly: Martin 1067 Wedge Dolly