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DaveSandan said..
I find this interesting but in reality how much faster? I surfed in the 70's and 80's and all boards were gloss and when you're on a wave you are going fast enough so does it really make that much difference??
See:
www.standupzone.com/forum/index.php?topic=7044.0This topic has been quite studied in naval construction. The faster you go, the greater the difference.
I used to sand my white glossy boards hulls (sailboards then SUPs), as since the difference was not obvious to the eye so it did not lower the resale value. The gain was very noticeable on the transition to planing: the board was getting on a plane much easier, it seems like there was less of a "hill" to overcome to get to planing. Also, the slight drag reduction was allowing me to keep speed in turns a tad longer, that could mean the difference between a so-so turn and a satisfying carve. Sanding fins also helped.
I sanded the paddle blade to ease water entry and exit, but could not notice a difference.
Once at speed on good waves, I did not feel a difference, but on marginal conditions, it was quite noticeable. Nowadays all good boards have a rough finish anyways.