So i have a 2008 polaris rmk 600. And im looking into repainting the hood. I was thinking about sanding it down, putting primer on it and using krylon spray paint to paint it and then just put a clear coat with hardener on it.
Not really. Auto paint, unless it's for plastic, will crack as the hood flexes. If you paint, get some of the Krylon Fusion. It's made for plastic and will hold up a lot better than paints that harden. There are probably other makers of paint for plastic if you search. I've used Fusion a few times over the years and it works ok. Sleds take a lot of abuse, especially if you like to boondock through the trees, so any paint you apply will eventually be scratched and scraped. It's just the nature of the beast.
That's correct. That's why the need for a paint that is appropriate for plastic. Paint for plastic has more flex to it than regular automotive or other enamel paint. Any paint is going to get rubbed off or scratched off, so you may have to re-paint if that's an issue for you.