A lot of club members got better wheels for their TR6, and I was given a set in better shape than the TR3 wheels I had. TR3 wheels are 4", TR6 are 5", opening up the options for wider tires that fit. But, it also bumped my car into the "modified" class at VTR. I sanded them to bare metal (not the inside) (but including the 'inner' side) and primed with white epoxy primer I had left over (used as a base coat so the grey would not show through the light yellow). Then I painted with a rattle can of Duplicolor "track tested" wheel coating. The finish from the can looks/feels almost like wrinkle paint up close, but after 20,000 miles, they still look good (especially considering the cost) and rinse clean. I'm running a set of 195/65 R15's from Discount Tires. It took several tries before they got them balanced, and I'm sure a better set of wheels would be nicer at highway speeds, but these work. -Attached is a picture from last year...
There's a lot of wheel and tire options, but I decided that I was already too far over budget. Sliding around the track is more fun than I could imagine.