Welcome to the world of plastic cars!
The paint on our cars is suceptable to "crazing" because the body flexes, but the paint don't. The fiberglass also expands/contracts differently than steel panels. Of course, over time, any paint will start to deteriorate, even the high dollar stuff.
If your car has to sit out in the cold a lot, that could accellerate the crazing, as does having to sit in the hot sun all the time...even with a cover.(The covers can't control the temperature. )
The paint will also start to "shrink" as it ages, and this will create the crazing/cracking. I've seen original paint, older cars, that look like they were painted with "crackle" paint, they have so much crazing goin on!
The only real solution for the problem is repainting, unfortunately. If you can live with the cracks in the paint, that's ok, too! We call it "Character"!!

PS leaks are fairly common, mostly on the steering cylinder, and control valve assy. They do tend to "weep" a bit as they get older. They are re-sealable, tho.