Jamie, use Interlux Fiberglass Bottomkote ACT. They recommend the gray white. Per the manual. Based on conversations with Eddie at Hunter, this is accurate. Some yards want to power wash the bottom on the hoist before setting up blocks. Just be careful and warn the yard to be gentle with the power wash b/c of the acp. Otherwise lightly scuffing the hull is fine. And remember no ammonia based or acetone based products for cleaning. Denatured alcolhol per the manual is the best. hth...
Paul.