I have a small dent about the size of a dime that has rust. My 4runner is black, is it possible to use rust reformer on this spot and just leave it the Matt black it turns into?
Ah I am in the same boat! I have two on my roof about the size of a dime and I was wondering the same thing. I was thinking about sanding off the rust and then paint/2k clear.
I have fixed multiple "dime sized" rust spots and would say the best thing to do is sand it down then use a primer, paint and sealer. The rust inhibitors can work but you should still go through the process of primer, paint and sealer as they wont hold up without in my experience.