Cracked fiberglass panels should be repaired before the crack worsens. A crack can continue to spread and also cause leaks through the fiberglass panel. Gelcoat is intended to be a protective barrier to keep moisture from the underlying surface.
Cracks also are ugly. They detract from the good looks of a fiberglass panel.
Fortunately these can be repaired. A short demonstration of the basics from BestBathUSA on Youtube.
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The actual repair is more involved, but it is possible to do it yourself. The correct tools and materials are required, but are widely available.