If anyone you know has a sailboat or powerboat with a nonslip deck you can quickly and easily pull a mold with some silicone molding compound. Apply epoxy to the mold and place it on the sanded, clean surface of the board and let it cure, peel off the mold, and viola. I have never tried this, with this material, for this purpose.

This is a link to US Composites: http://www.shopmaninc.com/moldmaking.html

Alternatively, I found the following about neoprene sheet at Sweet Composites: http://sweetcomposites.com/Minicel.html

We stock neoprene wetsuit material and also a stiffer grade for kneeling pads and similar uses. The R1400N Rubatex wetsuit material comes on rolls 42" x 50 ft [106 cm x 15.2 m] with a tolerance of ±5%. The nylon coating of all stock material is black. We can special order various colors in roll quantities only. The 1/8" [3mm] N1S is the most commonly used type for kayak or canoe sprayskirts. Try this link for instructions on how to make a sprayskirt. We have shock cord for sprayskirts on our Miscellaneous page.

Wetsuit neoprene may have occasional defects such as bubbles or wrinkles. Fifty-foot rolls may contain up to five minor defects and one splice in the fabric and still pass the manufacturer's inspection. Cut pieces less than five feet will generally be defect free. Larger cut pieces could occasionally have one or more defects. Edge defects are not counted as long as 40" of width remains unaffected. We cannot guarantee that orders for ten feet or more will be continuous material.

N1S = nylon fabric on one side N2S = nylon fabric on both sides
Thickness & Type 1-4 Ft 5-9 Ft 10-49 Ft 50-Ft Roll
R1400N 1/16" N1S black, 42" width 9.00 8.00 7.00 270.00
R1400N 1/16" N2S black/black, 42" 11.00 10.00 9.00 325.00
R1400N 1/8" N1S black, 42" width 13.00 12.00 11.00 411.00
R1400N 1/8" N2S black/black, 42" 17.00 15.50 13.50 545.00

McNett logo Melco™ tape from McNett can be used to reinforce glued seams in wetsuit neoprene instead of the neoprene strip, which is no longer available. When neoprene tape is used it is glued to the skin side. Melco is ironed on rather than glued and must go on the nylon side. We have used an iron set on “silk” for 15 seconds to produce a very tough bond but we advise all users to test a small piece on scraps before starting a real job. The tape is black and ¾" [20 mm] in width.
Melco™ tape, $90 for 60m roll (197 feet) Less than a roll, $0.60 per foot.