I step on mine all the time and I'm thankful for the non-skid present there. It's the single reason I haven't changed to the much more stylish Cruising Concepts tinted Lexan hatch. Well, that and the price.
I'd like to know the source of the information presented, particularly that contrasting non-skid was ever intended as a visual reference and now that non-skid might serve as a hide-all for poor tooling.
I know this might sound like an attack but I don't mean it to. As stated several times, I worked for several fiberglass sailboat manufacturers, was right there in the middle of it from tooling to production to administration and some of the info in this thread is absolutely baffling to me.
My response to the original poster is the non-skid is for safety, the contrasting color is purely cosmetic. Painting the existing pattern will degrade the already questionable non-skid performance unless a non-skid paint or non-skid additive is used.
And Bilbo is correct, dark colored non-skid gets far too hot in the sun. Light colors are the way to go. However, many manufacturers acquiesced to their customers' wishes as to color preferences so there were many darker non-skids produced. There is a vintage Catalina 27 with butterscotch non-skid on my dock and I can only imagine what it's like under bare feet.
Question for Phil:
Your hatch isn't cored?? Are you sure? Every hatch I've ever seen, seat hatches included, were cored. Some companies used plywood on the flatter small parts, others used end grain balsa and still others used a product called Core-mat.