Don't panic yet, how deep do they seem ? Boats get those all time, on the surface gelcoat, they're called spider cracks. From a google on fiberglass spider cracks
Spider cracks are small, hairlike cracks that appear on the gel-coat of boats. They are also referred to as "crazing". These cracks are generally cosmetic, and indicate flexing of the hull. Sometimes, however, spider cracks offer a path for water to get into contact with the fiberglass structure under the gel-coat. Prolonged contact with water can cause blisters. It is very common for older boats to show signs of spider cracking, as the gel-coat layer was often very thick. The thicker gel-coats can not withstand flexing well.
2014 F 250 Gasser
2019 Outdoors RV 21RD
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