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Spectrum offers a repair kit for filling nicks, scratches and gouges.

https://spectrumcolor-com.3dcartstore..._p_37.html

They sell gelcoat by the quart.
https://spectrumcolor-com.3dcartstore..._1005.html

Problem is the color match is not always spot on due to the age of your gelcoat and the color variations from the factory.

If you have a small chip or scratch I would use Locktite Marine Epoxy in White. It dries to a close match and costs $7 a tube rather than the $45.
https://www.lowes.com/pd/LOCTITE-Mari...e/50436714