When you have exposed areas, like gel coat cracks, missing caulk,fiberglass damge and more, it gathers
water and will run down into the fiberglass and wood damaging the area of travel, compromising everything it touches in time. You need to keep up on your protective layers before it gets to late and micro cracks develop and many other issues.
Gel coat is the protective layer used over fiberglass. This is a tight bond unless the gel coat starts to get oxidized and cracks. This means the fiberglass has slipped free from the gel coat due to drying out or what not This leaves an opening that water can travel down to. Compromising anything and everything in it's way. If left in a decaying state mold will grow and help break down all materials..