someone on here had success using a paint removing product on the inside of the drum. I think it was called clean strip? They have a thread on the process here somewhere
In your case, you'll need to tape and mask off the outside to save the paint, then apply the spray product to inside. If you are lucky, you can save the paint job.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. Weber SJS. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)