I applied Poli-Glow to my boat a few months ago. I used it from the gunwales down. If it holds up okay I'll do the topsides. What I would advise is to buy the kit and follow their instructions TO THE LETTER! First, the Poli-Prep to prep. I scrubbed and scrubbed every square inch up, down and sideways. A Scothbrite pad works better than the scruber they supply.
Next, Poli recommends a MINIMUM of 6 coats, and they're right. I used up to 12 coats on a few areas like the transom that had been exposed to direct sun for many, many years. The finish for the first few coats will look 'streaky' and you'll start to wonder if you made a huge mistake.As you apply successive coats, however, the finish will gradually get consistent and very smooth and shiny.
Make sure the boat's surface is cool. You may need to do the job over a couple of days to accomplish that. If the sun warms it, the applicator will begin to drag and you'll see a bit of a 'grain' in the finish.
Pay attention to their warnings about using harsh cleaners, spilling gasoline or other solvents on it, etc. Also be aware that you need to apply a couple of coats every year. If you aren't prepared for the upkeep, don't get involved with it. It'll probably look like crap in a couple of years.
It didn't make my hull look like new, but it took a good 15 years off it. I think it looks terrific.