In that case, why not sand it?
You would be amazed what some 24 grit discs on a right angle sander can
(BTW, it's a basic boat building tool.)
Use a straight edge as a batten, to find the high spots as you go.
When you get close, switch to a fairing board.
Since this is a relatively small piece, you won't need a big fairing board.
Mount some 24 grit flooring paper on a wooden concrete float with some
rubber cement and you are off and running with a one hand fairing board
about 3"-4" wide, 18" long.
BTW, don't waste your time with anything finer than 36 grit.
If you try, your arms will fall of before you finish<G>.
Been there, done that, screw the tee shirt, bring the cold beer.
If it's anything like the driftwood on the Upper Left Coast, it will have
sand, shells, bits of shell, mebbe rocks, and perhaps a critter or three.
Depending on the original source, it could also have nails, spikes, bob
wire and bullets. How much do you like your planer?
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