White vs. coloured hulls
Being the former owner of a dark blue hull, I perceive that there are other issues that would suggest the avoidance of a dark fiberglass hull. Unless the hull was specifically and originally layed-up as a dark hull and has ***sufficient/extra thickness of matting underlayment*** of the gelcoat, there will be eventual additive thermal deformation and dimensional changes of the surface as evidenced as "print-through" of the fiberglass roving, etc. or surface wrinkling. Most of this print-though may be cosmetic but some other dark hulls I''ve noticed seem to have accumulated/additive structural deformation where the dark hull intersects a bulkhead and/or chainplate attachments, etc. ---- very visible deformations. Simply take a walk around any boat yard and especially look at the older dark hulls (especially those constructed with fiberglass roving) ..... most are wrinkled and have ''print-through'' and other surface deformation. As one with an extensive stress analysis background, I perceive this is not good!. I further perceive that the base polyester polymer on a dark hull continues to additionally cure because of cyclic high thermal stress (constant heating and cooling) thus causing the print-through, wrinkling, and perhaps even structural anomolies. I understand that in the past, several manufacturers of cored composite hulls have had many problems (weakened laminate) with dark colored hulls - Niagara, etc.
But they are Pretty.......... until you eventually paint them white. :-)