I recently purchased the Poli Glow kit and the fiberglass shines like new. I have already had comments from another boat owner on my pier wanting to know what I was doing, what I was using, and where I got it. I applied it to my deck and cockpit. The Poli Prep did a great job of getting all of the crud off, although it could have done a better job getting off the oxidation (perhaps more elbow grease was needed). It did however yellow my white fiberglass, but only temporarily. Once it was hosed off and dried, it was white once again. Places with only slight oxidation took only a couple of coats of Poli Glow to restore the shine, but areas of heavy oxidation took 3 or 4 coats. I still have a few places to touch up, as well as a couple of runs to re-do, but she looks like a new boat. I figured that this was the last option before repainting the deck. Hopefully, with the prescribed maintenance, it will hold up over time. I have used water based polyurethanes before, and this stuff looks and feels the same. Is that what this stuff is, but perhaps with some U/V protection added? Joe s/v Charis