In my opinion (not a pro by any means) but it would be just as easy to spray gel coat as it would be to spray polyester. I have never done color additives to the gel coat but I did do the white and it was pretty easy. Looks up the hobie cat North America online hotline magazine and they have an article on spraying gel coat. Just make sure the weather is perfect! Humidity and temp fersure. Makes a world of difference!
1981 Hobie 16 cat fever
1981 Hobie 16 double plum