This was there when I bought it. This one had almost no change after 2.5 years. One of the four along the back did get bigger.
This one is right below the 4wd emblem on the right rear of the tub, '78.
This one is right below the 4wd emblem on the right rear of the tub, '78.



I have no idea. It's pretty similar to epoxy, so I would think not. I'll post up next time I get the grinder out back there, but I'm thinking that it will be good for at least 5 years.
I've got a nice paint gun. I'll get a dryer like this: