Had quite a bit of curb rash, and a lot of corrosion on my split rims. About a week after Silverstone was cut up by a Chav in a Nova near Epson badly denting one of the rears.
Had difficulty finding a decent Wheel refurbisher who would handle split rims.
Took all four to Wicked Wheels in Crawley who split them down, straightened the rims, welded new metal onto the curb damage before skimming them down with a lathe and repolishing. Corrosion was removed on main part of the wheels and re-powder coated. All work was done in 3 weeks and collected the afternoon of my Le Mans trip. cost £125 per wheel + VAT. As good as new now.
I think they are about £50 per wheel for non split rims but worth trying if you have damaged wheels
leigh