It's interesting to see the different shaft treatments people use.
Obviously a very personal thing. I have used surf wax on oar, hammer, wheel barrow, shovel handles etc. with great success to prevent blisters and helps preserve the wood too. Oh yeah! I've also used a lot of surf wax on surfboards too! Not sure I would want to put it on my paddle shaft. I have gotten used to not having any shaft treatments. I simply wet my hands and shaft at the beginning of a paddle and if it feels to slippery I rough up the control side with sand.
I have noticed that having separated the AC joint in my right shoulder from a surfing accident, my right arm is about 3cm longer than my left.
I now have asymmetrical placement of my hands on my paddle shaft with my left hand noticeably closer to the blade than my right. Good thing surfskis have rudders or I would be paddling in circles
Wow! I guess I have to take back what I said about paddle shaft treatments. Just pulled out an old paddle(s) on my way to the beach and found that I had used heat shrink tubing (that I found in the trash) on them. Works pretty good too.
My old paddles are round shafts where my new on is oval and doesn't seem to need alteration.