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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 10-16-2019, 09:39 AM
  #41  
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Put a little StarBrite hull cleaner on a sponge. Wipe on and in 2 seconds the stain is gone.. I put it on a sponge mop and can do my whole 23 ft skiff in no time..
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Old 10-16-2019, 09:45 AM
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I hear JJV's Best is a pretty good cleaner.....
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Old 10-16-2019, 02:54 PM
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Originally Posted by Mibeaulieu View Post
Bar Keepers Friend works very well. Its oxalic acid, it's very inexpensive and sold nearly everywhere. Put a little on a rag, wet, rub and rinse - stains are gone!
It's always very abrasive, like many of the other "solutions" here. So the stains will keep coming back, and on a gelcoat boat be deeper. Driving the need for a properly applied sealant ASAP.

Here's a photo of our boat on a mooring in Westport Harbor, MA. It had been down to Florida from NC and back up. Those who have done that trip know of the issues with the infamous "mustache" caused by the tannin blackwater along much of the way. This 1981 Hatteras is an older (maybe 15 years) Imron paint job, and Rejex'd.

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Old 10-16-2019, 03:33 PM
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This is a massive discussion for a small problem. Just use whichever is your favourite oxalic acid product - even if you use the most expensive double the strength it needs to be its hardly going to make a dent in your annual boating costs.
For the record I use Y-10 Gel - do I think itís any better than any of the other products out there? No idea, but itís the one my chandler sells so itís the easiest to pick up when Iím there getting other stuff and it works well enough for me to do round the whole hull in 10 mins, 8 mins of which is spent going to make a coffee whilst it does its stuff.
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Old 10-16-2019, 03:44 PM
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I use this stuff, non acid and works well. https://www.booyahclean.com/collecti...t-hull-cleaner
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Old 10-16-2019, 05:50 PM
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Originally Posted by Frantically Relaxing As to the Kleen Strip muriatic acid in the video, the MSDS states the 'actual content of hydrogen chloride is withheld as a trade secret'. LOL.. Because they say to use it full strength on boats, my guess is at best it's 10% hydrogen chloride. Which isn't all that strong.
Originally Posted by 95wellcraft View Post
If you have done just a little more investigating you would have found that it is 20%
There's at least 3 different Kleen Strip muriatic acid types out there, what you found was
GKGM75006-KSG-'Safer' in 20%--




Then there's some killer stuff here, GMA58-SDS-905, as high as 35%-!




And this is GKGM75006-SDS-903, that I was referring to, 'trade secret' specific concentration, less than 30% is all the info you get...


============================

Just saying, read the labels! And when it comes to ACID, I really don't think the actual acid content should be a trade secret...


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Old 10-16-2019, 09:53 PM
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See the 2nd review:
https://www.amazon.com/gp/product/B0000AXNNA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B0000AXNNA/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
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Old 10-16-2019, 10:38 PM
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I can tell you what worked amazing for me. 50/50 dawn soap and vinegar. Discovered it trying to clean a rusted up bathroom for a home sale. Acids and everything wouldnít work. Dawn and Vinegar folks. Miracle maker
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Old 10-17-2019, 07:32 AM
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^ just fyi, Dawn will strip off polish, so after you've removed the stains, reapply a quality polish to provide a barrier against future staining.
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Old 10-17-2019, 12:10 PM
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I used this this morning. Used it for years. 2 table spoons in a quart spray bottle of hot water. Spray on, NO SCRUBBING or WIPING, let it sit 10 minutes or so and spray off. It's that simple.
It's 20 oz. Will probably make 30-40 quarts.
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Old 10-17-2019, 12:30 PM
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Originally Posted by satbeachbill View Post

I used this this morning. Used it for years. 2 table spoons in a quart spray bottle of hot water. Spray on, NO SCRUBBING or WIPING, let it sit 10 minutes or so and spray off. It's that simple.
It's 20 oz. Will probably make 30-40 quarts.

Imagine that.
It's a MaryKate CRC product
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Old 10-17-2019, 12:42 PM
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Originally Posted by captpepin View Post
You guys want to use Muratic acid and other Crazy stuff to get a simple scum line off. Get out heavy duty gloves and a gas mask for such a simple job. All of the acid based cleaners will damage your trailer and possibly destroy any stainless on your boat.

Highly diluted Oxalic acid will do just fine but watch were you spray it. The one advantage to Y10 or FSR is that they are a paste and it sticks to the hull no mess. Spray your trailer with water then Slather Y10 or FSR on let it sit use light pressure on dark spots or reapply then wipe off then spray off apply some wax and your done.

Itís only a one beer job maybe a tall boy tops.
I was going to recommend FSR for that reason. Its expensive but its a gel and it only goes where you wipe it on. It won't drip off and get on your bottom paint etc. Wipe on, wait 2 minutes, hose it off liberally and reapply wax. Done.
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Old 10-17-2019, 12:48 PM
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Originally Posted by billatstarbrite View Post
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.
^^^^^^^ this is why I have used with great success...naval jelly...brush it on, let sit 10-15 min. hose it off, it doesn't run like the liquids...
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Old 10-17-2019, 12:57 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.
That stuff is $18 you can get Whink Rust Stain Remover sold at just about any grocery store for under $4
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Old 10-17-2019, 01:03 PM
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Originally Posted by billatstarbrite View Post
^ just fyi, Dawn will strip off polish, so after you've removed the stains, reapply a quality polish to provide a barrier against future staining.
Thats a myth.

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Old 10-17-2019, 01:38 PM
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I use straight muriatic/ hydrochloric acid on a rag with some latex gloves. I spray water on my trailer first then just wipe it onto the hull with the rag. Then hose down to neutralize. Then hose down the rag and toss it in the trash. A pump sprayer would make a hell of a mess IMO.
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Old 10-17-2019, 03:43 PM
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The Works works, $.99 at the Dollar Store. I wouldn’t use anything else.
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Old 10-18-2019, 09:42 AM
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Anybody got anything they use while the boat is in the water? I do an annual hull cleaning, followed by wax at the beginning of each season but I pull the boat for waxing. It would be nice to address this in the water at the doc.
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Old 10-18-2019, 12:25 PM
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Originally Posted by LITECATCH View Post
This. Been using it for years on various boats with great results.
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Old 10-18-2019, 12:26 PM
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I use the Colonite cleaner, before using their wax. Does a good job removing the stains.
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