Drifter has never gotten a sunburn... neither have any of the other dogs that were shaved by that groomer, she said it was because she always left just enough to avoid that problem.
Not sure if there is any truth to that or not though, but as one can see, he isn't completely bare.
Drifter before being shaved:
But like I said, shaving ones dog is not the answer for everyone but it works for me.
If all else the Furminator is a great tool as well.