I'm about to make a purchase for "Home Movies"... (surf!)...

Main purpose, use Gaffa/Duct Tape, to tape it onto a 9 foot longboard, for moderately powerful surf... (no gaffa tape puns please!

)
GoPro is nowhere(!) near as slim lined as the rest;
The plan, fashion a little foam mount to get the angle, and to also smooth out "resistance from the surf"... I was thinking along the lines of a "mini-747-esque" pop-up section on the nose, with no shortage of Thick Grey-Gaffa Tape...
So the camera needs to be water-resistant...
Is 'naked' Contour or Replay (brands) 'water-resistant' enough for this purpose, or would you want the 'Water Proof Housings'.
Thanks.