I don't know anyone but be carful what they use, I've heard horror stories about the rubber or hard shell stuff. My Silverado has some tar like stuff from before I bought it and once the moisture and salt got under it the rust was way worse than areas without the tar. The worst part is you don't see the rust till the tar starts peeling away.
I've had good luck with the oil based stuff I reapply annually on my fzj80. I use Woolwax and do it myself. Recoat once a year. Its easer if you have an air compressor but doable with the rattle cans.