Originally Posted by misfits
Someone also had mentioned using a drywall sander & screen on the end of a wooden broom pole. Easier on the back & you're not covered in dust being under the boat.
Please note that if you do the drywall sander/screen, you wet the surface first. Wet a few feet down with a hose and wash out the screen frequently. Actually pretty fast and it's dust free that way.
I would NEVER dry sand a bottom again. I can still remember the taste of copper, not to mention the mess downwind.