Buy the Hutchins Flexible Longboard 2-3/4 inches wide x 16 inches long on www.jamestowndistributors.com/ 
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Brand: Hutchins
Online Retailer ID: 4
Located in: Abrasives, Longboards and Blocks
Hutchins Longboards are lightweight, flexible, and rugged. They feature a cushioned surface with spring clips at each end. Longboards are used to cover large areas when sanding and finishing to save time and energy. Use 2-3/4" x 17-1/2" Paper or 2-3/4" x 16-1/2" PSA (pressure sensitive adhesive) sandpaper.
Only way to sand the Bottom of a boat
By Grits from Newport, RI on 2/27/2008
Pros:
Easy to Use, Weather Proof
Best Uses:
Outdoor
Describe Yourself:
Competitive
You need a nice flexible longboard if your looking for a fast and fair bottom. It nice to be able to get the contour correct to avoid flat spots.