I bought some Poli Glow after seeing Bushwacker's Seafari in Key Largo. I've now used it on both my 20SF and my 18 Action Craft. The Seacraft looks like new. The Action Craft looks, well, shiny.
The gelcoat on my 20 SF was in fair shape, just dull. I used a liquid rust stain remover I picked up at Lowes to get rust and tannin stains off, then pretty much just followed the poli prep and poli glow instructions. Although the instructions say it's not for automotive finishes, which I assume means any painted finish, I used it on my motor too. The lower cowl and mid section had no gloss at all, but now they do.
My action craft is a medium blue and was severely oxidized. I wet sanded it with 1000 grit and brought most of the color back, but there is still some oxidation. At least with the Poli Glow, it's shiny oxidation. Doesn't look bad from a distance of 10' or more.
So, I recommend the product. But as with any coating, and this is a clear coat, not a wax, the prep will make or break the end result. I'll try to post before/after pictures, but if you look at the Poli Glow web site, you'll get the idea. Their before/after shots are similar to my results.
Oh, and after doing both boats, I still have half a bottle of each product left. This isn't a product I would have bought based just on their advertisement. I'm a born skeptic, and their results look too good to be true. I owe a debt of gratitude to Bushwacker for his recommendation. The stuff works.
Dave