I can see them now. They don´t look THAT bad to me. Maybe I have low standards:(....
Of course they will consume easily two or three days of work worth of your time, but they´ll look really good in the end. What kind of paint will you be using? Any particular color?
Why would you be baking them in the grill, is just beyond me. I know that it helps a lot with the settling, curing of the paint or whatever that process it´s called, as ramblin man properly explained. But if it was my grill, people would turn their heads as I drove by wondering where the BBQ is. And I definitely don´t want my BBQ to taste like paint or any chemicals for that matter. Maybe you guys have two grills, one for food, one for...rims. I have only one and it´s for food only.