all i used was a electric sander. If your not happy of the results because of the discoloration caused by the sander, you can also apply a coat of varnish to get the best results but i didn't use any and it still looked great.
Step 2: Start Sanding The Oar
press hard for this step to make the process go faster (but not to hard so your arms will be sore for a couple days or that you will break your sander if your using one.).
Step 3: You are done!
Now, as i said earlier before in this article, you may apply a light coat of varnish to make it look better.