The only way I found how to do it is with a homemade sanding jig I made from 2 1/2" angle iron (or aluminum if lucky) that I drilled & bolted a 3" strap on to one side that I covered with Great planes sandpaper rolls . Laid the wood against the sandpaper & just slid it back & forth a few times . Mine is 4' long & VERY heavy but does the job Ok . Max H.