The best Non-Skid resurfacing I've seen lately is Kiwi-Grip. You can find the details at Anti-skid Boat Decks from Pachena LLC - KiwiGrip anti-slip deck coating
BTW: after reading dozens of posts pertaining to the drill & fill technique, I'm having serious, second thoughts about having a full core replacement done. At this point, though, I'm awaiting estimates from at least three sources. It's just amazing at how lackluster these folks seem to be. Two weeks and no responses to phone calls or emails. You would think they would want to make some money, but I guess not.