I have a 25 year old sailboat with a horrible light blue deck. I would like to paint it white, but am unsure if I should just use a plain fibreglass paint or if I should use some sort of gel coat. I suspect the original blue is a gel coat.
Also there are some small spider web-like cracks in the surface. What is the best way to fill these in before I paint?
How should I prepare the surface?

Thanks
Mike