Re: 2003 Sea Pro SV1900, small hull repair and small deck repair, what do I use?
I'd just use marine tex or something similar on the chips and nicks; it's not a big deal. Assuming you don't want to "restore to original."
Not much you can do about spider cracks, either existing or to come.
As far as the sun goes, use your automobile by analogy: do you keep it in a garage so it will always look new? Or do you put a cover on it when it's parked so it will always look kinda new? Or do you park it outside, and wash and wax as needed, so it will look good for its age? A working boat is the same way. The time and money you spend to preserve its cosmetic appearance is time and money away from using it. The advice you will get here will range from "garage kept" to "leave it outside."
If it's the boat I'm thinking of, it's made to be outside and I wouldn't worry about it, once you give it a thorough cleaning and waxing. if it's in real bad shape, just like a car, there are compounds for restoring shine.
Not talking about upholstery, consoles, etc.