Kiwi Grip
 

Just got done replacing my cockpit sole and getting ready to kiwi grip do I need to fair deck before I place Kiwi Grip down? I was figuring since it was so thick that it would fill in any low spots.

Give their customer support a call. Before you do, I'd suggest you run some lines so you have an idea of how much height you are trying to compensate for and they can tell whether or not you are expecting the impossible.

Definitely fair to make everything the same level. The stuff is pretty forgiving when it comes to small nicks and holes but it won't make a large area level. It's not much thicker than regular non-skid after it's rolled out. Be sure to use a course grit paper like 80 so you have a good bond.