Roll the boat up on edge, remove the bulk of the beasties with a scraper,
then get some coarse sandpaper as in 40 grit and have at it. A belt sander
will work if you are skilled otherwise stick to a vibrator. Don't even
think of using a disk sander. Random orbital probably won't work well with
really coarse paper.
Dave

Won't that really mess up the bottom of a fiberglass boat? Not that it's in
the best shape after all the
coconuts and lawn chairs I've hit. Wouldn't there be
some kind of acid based product that will remove them?




"Dave W" wrote in message
...
Roll the boat up on edge, remove the bulk of the beasties with a scraper,
then get some coarse sandpaper as in 40 grit and have at it. A belt
sander will work if you are skilled otherwise stick to a vibrator. Don't
even think of using a disk sander. Random orbital probably won't work
well with really coarse paper.
Dave

mgarvie wrote:
Won't that really mess up the bottom of a fiberglass boat? Not that it's in
the best shape after all the
coconuts and lawn chairs I've hit. Wouldn't there be
some kind of acid based product that will remove them?

Scrape off what you can , then try muraitic acid. Sno-bowl toilet
cleaner might work also. Rubber gloves are essential, don't breathe the
fumes. Sam

.......otherwise stick to a vibrator.????