Shortwave Sportfishing wrote:
On Sun, 12 Mar 2006 15:24:57 -0600, (Gudmundur)
wrote:

Hi Folks,

I have just a small 15ft fiberglass open bow ski boat. I am it's
second owner, and the first owner left it in the river about 8 months
every year. Problem is he never cleaned the scum and grime from the
underside. The whole bottom of the boat now feels like 80 grit sandpaper.

I realize cleaning this mess up won't be easy, but can anyone recommend
a good cleaner to help remove the scale? I thought the fiberglass was
actually damaged but that does not seem to be the case. My trailer has
bunks without rollers and I have found that the areas that slid on the
bunks are scale free, this includes the recent areas where I hit the bunks
a little off to the side.

As scaled up as the bottom is it would seem I may be losing a few MPH
on the top end. It will be interesting to do a before/after speed check.

http://www.barkeepersfriend.com/index2.htm

or if it's really stained a 50/50 mix of muratic acid. It's a little
tough to work with if you mix it yourself, but you can get premixes at
places like West Marine what will make your life easier.



Don't you mean oaxalic acid? Muriatic acid is sulfuric acid, if I'm not
mistaken, and while it works wonders for unclogging drain pipes it
might be too strong or too hazardous to be splashing around a boat.