68 barracuda 383s "Driver Paint Resto"

Using different colors is a good idea. If you're going back with the factory green, it may be best to use a dark epoxy, and then light gray 2K primer. You can also buy some stuff called guide coat, at the auto paint store. I don't know if that's a brand name, but it comes in spray cans. Most people spray dots or lines on the car between rounds of blocking, to see where low spots or high spots are. Adding to what Barbee said....you can usually feel more than you can see. When you're finished blocking an area, and your hands are dusty....use your non dominate hand to rub across the body. (If you're right handed, use your left hand) You will be able to feel dents that you can't see. You're clicking along well with the stripping. That's a messy job, no matter how you go about it!