Herb, sounds like you are happy with the job it did on the front. Do you remember the name, and source. Thanks!
So far I'm happy but I haven'ty driven any gravel roads yet so don't know how it'll hold up to direct rock impact... My trucks don't have mud flaps... I applied it to the side of my truck as well as the front of the hood... In 2 years of driving in Calgary gravel-pit streets, it hasn't chipped off the front of the hood.
The stuff I used is "Hippo Liner" by Dominion Sure Seal which I got at Canadian Tire... I do note that it doesn't weather as welll as some of the professional grade stuff.. On my truck, I sprayed the wheel wells two years ago and it's already looking somewhat oxidized as compared to the freshly applied stuff on the boler
(the stuff on the truck still looks black until it's parked next to the boler, which makes it look slightly more grey now).
Here it is on my truck:
On my truck I used a schutz gun to apply it... The schutz gun basically sucks the goop up through a straw and shoots globules out of a small tube causing these globules to go flying everywhere including your garage floor... On the boler, I used the roller that came in the kit and I have to say the resulting texture is approximately the same as the schutz gun but took far less masking/protecting/cleaning and was easier to do...
For prep, I filled all the old chips with bondo, sanded the whole area with 180 grit on my air-sander, cleaned with silicone/wax/tar remover ("Sure Wipe" by dominion sure seal), masked and rolled on.
When I was done, I had some left on the roller so I rolled it across the top of the back bumper of the boler because my son likes to climb on it. Then it was covered up when I painted the bumper and so retains a bit of a non-skid texture.