Fine stress cracks, if they are only superficial, occur because too much gelcoat was sprayed in the mold when the hull was laid up and even the smallest amount of flex will cause cracking. If it's deeper than the surface, then it does need to be addressed.
2015 Seaark 1872 MV CC Etec-90
Helix 12 CHIRP SI, HB 1199, MinnKota Riptide ST80/i-pilot Link, Bob's Hydraulic
Bitter Gun Owner