My board is really thick, like 3 5/8 and the rails can be really hard to grab, sometimes it does not matter too much, it just looks funny when I try to do a quick turn and paddle, lose my grip on the rails and the board flies out from under me like a dirty big banana.
Other time, it can be a bit dangerous when I'm trying to stop it from hitting someone or something.
So I went out and bought a cake of the softest wax I could find, it cost me 6 bucks and there's no way I would every pay that much to wax a board, but if this worked, I would take a long time to get through it.
Before I went out for my last 2 surfs, I covered the palms and fingers of both my hands with it to see if it helped, I think it did, not only did I feel a better grip on the rails, it seemed to help my popup (trust me, it needs a lot of help) another plus was that it helped get a good grip on the board as I carried it down.
On the down side, I'm not sure when I should put my sunscreen on, before or after the wax (ATM I'm just using a single fingertip to apply it after I put the wax on) secondly, until you can get to somewhere with some warm water and soap, it feels weird between your fingers after you're out of the water.
I may keep doing it for a bit longer.