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Removing that "Coffee Stain" after the boat has been siting in the water

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Removing that "Coffee Stain" after the boat has been siting in the water

Old 10-15-2019, 12:43 PM
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Default Removing that "Coffee Stain" after the boat has been siting in the water

I'm not sure about other locations, but in the northeast, your boat get's an ugly brown "coffee stain ring" all around the bottom of the boat just above the water surface, after the boat has been sitting in the water. This year I tried using 3M heavy cut compound after I took the boat out of the water. I could not believe how quickly and easily it removed the stain without any type of machinery. I just put some of the compound on a wash-cloth and rubbed the area by hand. No heavy rubbing was required. It took me 10 to 15 minutes to clean the entire ring around the boat.

I just thought that I would pass along the tip. Last season I tried a pressure washer and liquid household cleaners without a lot of success.
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Old 10-15-2019, 12:47 PM
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i use collinite cleaner and a rag
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Old 10-15-2019, 12:47 PM
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Don't think I'd use cutting compound. A quick squirt with an acid based cleaner (toilet bowl cleaner is my goto, or some boat on bottle stuff if you must pay more). Squirt it on, wait 5 mins, quick wipe with a sponge just to make sure not spots missed and hose it all off. Literally as close to zero effort as possible. When you buff, especially with heavy cut compound, you are basically sanding a layer of gelcoat/paint off your boat. After a few years of doing this it will show. Acid cleaner just removes the stain, leaving the gelcoat as good as new.
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Old 10-15-2019, 12:48 PM
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Marykate On & Off Hull & Bottom Cleaner will get it for sure but that is some strong stuff. You'll need to wax and/or polish the hull after you use this cleaner. I've heard people having success with The Works from the Dollar Tree.
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Old 10-15-2019, 12:51 PM
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Toilet bowl cleaner or Mary Kate's work
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Old 10-15-2019, 01:03 PM
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The Works sold by Dollar General for $1.50 per bottle, with a scrub brush.
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Old 10-15-2019, 01:04 PM
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Rust aid made by Goof off. You can get it at Lowe's or Home Depot for about 10 bucks a gallon. I put it in a pump up sprayer.
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Old 10-15-2019, 01:08 PM
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Old 10-15-2019, 01:12 PM
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Maybe there is a cheaper solution but I use west marine rust stain remover.

takes it off instantly. Just spray on and wash off.
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Old 10-15-2019, 01:17 PM
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Originally Posted by Killintide904 View Post
Maybe there is a cheaper solution but I use west marine rust stain remover.

takes it off instantly. Just spray on and wash off.
Acid is acid. If it makes you feel better to pay $20/bottle instead of $2 that is your right and privilege and kudos to the west marine marketers for convincing you as such!
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Old 10-15-2019, 01:27 PM
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Default Goof Off Rust Remover or Mary Kate On Off

You can put a liquid called Goof Off Rust Remover In a pump sprayer and just spray it on - with literally no rubbing the stains just disappear in about 2 minutes - Have a water hose ready to go because you will want to wash it right off.

For tougher stains Mary Kate On Off is amazing, but VERY powerful and caustic. I believe it is muriatic acid based. I think the best way is to paint it on and if you don’t use a natural hair brush - it will literally melt it! If you use tape to protect your bottom paint - It will melt that too. You definitely don’t want to breath the stuff in, but this stuff will remove any water stain I have run into and instantly - no rubbing. Here is a hint - Mary Kate has put out a new Gell On Off which is much easier to apply without it running onto surfaces you don’t want it to touch.

Again - Keep the water hose handy!
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Old 10-15-2019, 01:27 PM
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Not all acids are the same - some such as sulphuric are way more caustic than an oxalic acid which is pretty benign to everything but works like crazy on tannin stains. Oxalic acid-based hull cleaners usually are good to strip away waterline stains. They also remove polish so be prepared to reapply. Keep all cleaners away from bottom paint.
A compound will certainly do the trick but may be a wee bit more powerful than is needed in most cases. "Don't use a 50 cal if a 22 will do the trick" is what grandpa used to say.
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Old 10-15-2019, 01:29 PM
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sno-bowl toilet cleaner
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Old 10-15-2019, 01:30 PM
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Old 10-15-2019, 01:35 PM
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A coating of a polymer polish on a just-cleaned hull will help keep it that way. In many cases you can remove new waterline stains (after you've polished) with boat soap.
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Old 10-15-2019, 01:38 PM
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You can get a lifetime supply of oxalic crystals for about $27 (10#). dissolve about 2 parts of crystals in one part of water, and wipe on, wait, wash off, re-wax.
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Old 10-15-2019, 01:38 PM
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If you use acids intended to clean porcelain or pools, be careful to avoid spills or splashes on aluminum trailers (or your skin) or polished metals to avoid discoloration. They can also damage decals and tape boot stripes, so be precise.
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Old 10-15-2019, 02:11 PM
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10% muriatic in a pump sprayer.
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Old 10-15-2019, 02:19 PM
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Originally Posted by rustybucket View Post
Acid is acid. If it makes you feel better to pay $20/bottle instead of $2 that is your right and privilege and kudos to the west marine marketers for convincing you as such!

yeah it feels great!
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Old 10-15-2019, 02:46 PM
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Originally Posted by thataway View Post
You can get a lifetime supply of oxalic crystals for about $27 (10#). dissolve about 2 parts of crystals in one part of water, and wipe on, wait, wash off, re-wax.
$20 @ Ace
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