If you end up having to recore the deck... It is very difficult to refinish the top and make it look nice. It will end up looking different from the rest of the boat - regardless of how careful you are.
Repairing it from the underside can be pretty soul-destroying...messy and you're working in very cramped quarters.
My suggestion would be to do it from the top. It will be much quicker. When you have finished, sand the entire deck smooth - and then apply the Vetus non-skid (or similar product) everywhere that you currently have a non-skid surface. There are a couple of Catalina 30's at my marina - side by side funnily enough - that have done this and it looks very good.
It will seem expensive when you first consider it, but in the long run it's not going to be too much more than you'll spend on various products trying to get a decent finish. You can even do it in stages.
If you ever decide you want to sell the boat, and if it has a poorly finished deck repair...you're going to get zilch for it.
Last edited by Sailormann; 05-26-2007 at 12:10 AM.