I have seen mixed reviews about this process.
The price is certainly right, but it will last at best 1-2 years and some say it is harder to do each time, eventually not working at all. Curiously, another review said that it was easier every time. In any case, there seems to be a risk that the plastic is permanently damaged and is made more brittle by the heat, which makes sense to me.
Eastwood sells a product called Plastic Resurfacer Matte Black Aerosol that is just under $30 and is supposed to cover 5 sq ft. If the literature is to be believed it has passed the ASTM UV resistance test for 7+ years of exposure without fading. Also, for what its worth, it was a Popular Mechanics Editor's Choice award winner at the 2014 SEMA show. I haven't used it yet, but have a can and will be pulling the door panels this winter to see what it does.
Sky NA 2007 Midnight Blue
Sky RL 2008 Carbon Flash - Naked