You can add pigment to your gel coat repair. For my boat I asked Mike Porter what pigment was used. Then I found the exact same pigment on Ebay in an amateur quantity (1/4 liter) and more important, for a friendly price.
When painting your hull choose a colour similar to the existing hull colour. Then when you scartch it it won’t be as obvious as with a contrasting colour.
Having had some experience with gel coat repair and pigments I wander if it is possible to paint a hull using (pigmented) gel coat? Or is it the same as two pot marine paint? Maybe some polyester specialist out there can shed some light on this?