Noticing that some of the hatch covers and blacker appliances on my kayak are starting to show signs of "sun stress". Anyone with low-grade patio furniture knows about the white chalky film that eventually develops on PVC-based lawnchairs left out in the sun, and I'm starting to get a little bit of the 'grainy' look that is that stuff's predecessor on some surfaces of my kayak. I expect it'll be quite a while before it penetrates enough to become anything more than mildly cosmetic damage like the brittleness that takes those cheapo lawnchairs out after four years or so, but protecting my kayak for those longer days of bright and sunny boat tours might not be a bad idea.
Doesn anyone know of any practical preservative treatments in, say, spray form? Also, I only see this on the blacker materials but is it ever going to be something to think about for the main body of the kayak itself which appears to be made out of a softer plastic material?