I did it on my last truck. I followed the directions completely and it looked excellent when first done. It started to thin out over time, almost as though it was washing off the truck.

Maybe I didn't scratch the surface enough. Also it started to fade slightly. It isn't as smooth as a sprayed in liner (feels rough like sand paper) Other than that it protected my bed very well and didn't allow loads to slide around like they did when the original plastic liner was in the bed. For the extra money I will have a spray in liner put in my new truck when the time comes.