It's certainly the case that if you over pigment with black it slows the cure a bit but I dont think it actually prevents it. I've used black a lot and it takes very little pigment to make a solid colour. The pigments I've found to be the thinnest are yellow and orange. If laminating, rather than over pigmenting or using too thick a gel, I slightly pigment the following couple of laminate layers to ensure there is no see through. I know it's considered back practice because you can't see the detail of your laminating but if it's a light pigment I've found no difficulty.
Anyway, I've had two black hulls and they are excellent because they don't show the filth that is inevitable on a rib hull, inside and out. Up here, the deck becoming too hot in the sun isn't a problem but it certainly could be in a sunnier climate. A white deck is going to look scruffy almost immediately and you're going to need shades when the sun is out. I'll no doubt get shot down about that comment.