SPECTRUM COLOR have prepared a demonstration showing use of their gel coat paste to make repairs to small cosmetic damage. See
https://www.youtube.com/watch?v=_SQY2_y4Zhw&t=4s
Nota Bene: the audio level in this presentation jumps to extremely high volume whenever a power tool is used compared to the very soft level of the narration. Be prepared for the audio level to make very big change in volume.