The SeaDek product you see in the photo posted is their Teak Immitation, this type of Seadek has grooves which are made by Brushing the product with a roller that has thousands of needles and as the EVA foam is passed thru the roller,it creates fine grooves, then it is routed every 2 or 3 inches to give it the look of teak planks, I would not want this product on my deck if I was a hardcore fisherman as the blood will get in the grooves and then it will be very hard to remove.
I know this product very well as I developed an exact same product to compete with Seadek which is sold under the brand name of Reflex which in turn is sold to boat manufacturers the likes of Monterey and other Ski type boats made in Georgia/Tenn.
I had it on my Parker as coaming pads and they held up very nice, however they are stiff for coaming pads, on my new boat I have placed them under the gunnels to keep rods/reels from scratching sides in two color 5 MM thickness with name engraved in center, looks realy sharp and works well for intended purpose.
Robert