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Deckhand

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USA
9 Posts
Initially Posted - 01/01/2004 :  14:29:12  Show Profile
Our 1981 Catalina 25 spent all of its life in a freshwater upstate New York lake. The port side has a line of scum type substance at the water line. It is hard and crusty. We have tried scraping it off, and using a mineral deposit remover, to no avail. Any suggestions? Thank you for your help.
Sue
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 01/01/2004 :  14:32:10  Show Profile
I'd try 3M Heavy Duty Fibeglass cleaner/restorer + elbow grease...
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 01/01/2004 :  15:06:15  Show Profile
Use toilet bowl cleaner (I like Zep scented from Home Depot) to get rid of organic stains. I like toilet bowl cleaners because the thickened formula will stay where you put it. I sometimes apply the thickened cleaner with a paint brush, then let it sit for about 15 minutes, and finally wipe it off with scrubby sponge. Harder stains might need some scrubbing, but let the acid do the work for you by letting it stay on a little longer.

Keep in mind that toilet bowl cleaner is <i>hydrochloric acid</i>, so wear rubber gloves and eye protection.
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 01/01/2004 :  18:57:19  Show Profile  Visit Leon Sisson's Homepage
Sue,

I agree with Don. For waterline stains, use toilet bowl cleaner, gloves, scrub brush, rinse promptly to avoid damage. Hydrochloric acid will also remove rust stains, but once again, be sure to rinse right away. Some of that stuff is so strong, I'm surprised they sell it to the general public.

-- Leon Sisson
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 01/02/2004 :  10:01:13  Show Profile  Visit Douglas's Homepage
Hydrocloric acid ((WOW)) that sounds a bit dangerous. I have alwased used Oxalic acid. The powder form can be bought in a hardware store and it can be mixed in anything from a paste to a liquid. Removes rust and stains, bleaches wood for restoration.
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 01/02/2004 :  11:32:30  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Douglas</i>
<br />Hydrocloric acid ((WOW)) that sounds a bit dangerous.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

It can be if you're not careful, but remember that Mom and Grandma have been using this stuff to scrub their toilets for decades.

I've been using it for years and haven't had a problem. If you get some on your skin, <i>which you will</i>, simply rinse it off.

My technique for getting rid of the scum line goes something like this...

Wearing a long sleeve shirt and glasses, I pour some toilet bowl cleaner onto a scrubby sponge then apply it to the scumline using a light circular motion ensuring that I leave a thick enough coat to work on the scum. I make my way around the entire boat this way, and when I finish the application coat, I go back over the scumline using slightly more scrubbing pressure to loosen up the thicker scum. Once this is done, I rinse the boat thoroughly, then make a lap around the waterline with regular soap and water.

Remember a little cleaner goes a long way. I'm still working on the original gallon jug of ZEP scented commercial toilet bowl cleaner that I bought in 1995.
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triley
Captain

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USA
251 Posts
Response Posted - 01/02/2004 :  15:09:36  Show Profile
oxalic acid has been my favorite as well. Be careful, though, and don't use it over concrete or it will eat it away. The last few years I have been waxing the hull well and using the green stuff that starbrite sells in the fall after working along the hull at kleast twice during the summer with soap and water and rewaxing. Works great.

Tom
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.