Cracks in gelcoat can be repaired with a gelcoat repair kit that you can purchase from marine suppliers. They generally come with several coloring agents that you can mix in to get an exact match to the color of your existing gelcoat.
--2005 F350 Superduty Crewcab, 6.0, 4wd, short bed, 3.73 gears
--2016 Montana 3711FL, 40'
--SOLD 2014 Wildcat 327CK, 38'