I like it in the areas where it serves a purpose. For example, if you are the one poling your boat put the 8mm or better yet 13mm on the poling platform...it's super comfy if you are like me and don't where shoes or flip flops on the boat. I like it on the step up to the platform for traction to get up and down quickly, in the cockpit helm area to keep your bare feet drier and warmer in the winter (this was kind of a big deal for me as we fish all year) and for traction, on the front hatch for traction to fight fish when it's sporty and of course the casting platform (another really good candidate for 13mm).
We did a custom helm pad that goes all the way to the gunnels, that way we can transport all of our rods and reels rigged and not worry about reel rash from the floors non-skid.
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I have not had the same problems as everyone else with it getting dirty. Then again all are barefoot when on the boat....no shoes or flip flops. I think this really helps keep it clean. Once every 3 or 4 washes we'll put Soft Scrub w/ Bleach on the Sea Dek...scrub it with a brush and let it sit while we flush the motor, then rinse really well (or it will leave a residue). It comes out looking new every time. Here's the complete set up (white boat):
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