I wanted to protect the battery holder area in Alice when I was putting it all together and thought using 'Flex Seal' would do the trick. Since this is a 'rubberized coating', it would help protect from the battery acid corrosion that was present when I took things apart. So before installing the dash console that has the holder built into it, I masked off what I didn't want covered with the coating and gave it a couple layers of the Flex Seal. Here's what it looked like before.
And the after pics.
Another area that folks with cast iron wheel weights might like to protect is the surface the weights contact the wheels. Cast weights are rough and chew the paint up on your wheels. Mask off the weight areas not making wheel contact and give it a couple coats of the Flex Seal. It comes in several different colors now, but White or Black would probably work well. You may be able to put the FS on first and paint over it, but I haven't tried that yet.