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Old 07-08-2016, 06:03 AM   #101
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Originally Posted by JDCAVE View Post
If "On and Off" or toilet bowl cleaners or other acid product remove the stain, it's not tannins but something else. "Tannic acids" are neutralized and removed by basic products. Stains in stainless coffee carafes and teapots are typically removed by TSP or caustic soda. I suspect the brown stains on boats are iron oxides and are therefore most easily removed by oxalic or nitric acid.

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Here in RI it appears to be mineral and metallic oxides. I use 25% muriatic acid solution home mixed, sprayed or wiped on and left for a few minutes until the stains dissappear and then hosed off. Very cheap and easy. Two coats of Collonite wax goes a long way to reduce the staining.
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Old 07-08-2016, 06:20 AM   #102
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"And have the dock yacht police complain to the manager about my boat being unsightly and a future derelict? "

DERELICT boats never move , decade to decade.

Your mustache is proof yours is not a derelict.
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Old 07-09-2016, 03:42 PM   #103
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Recently hauled Badger and used Starbrite's SeaSafe Hull Cleaner (because it was all I could find locally) and it worked "good enough"...as in from 30 feet away our 30 foot boat looks pretty good

Sea Safe Hull Cleaner
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Old 07-09-2016, 04:04 PM   #104
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...and from the arse end;
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Old 07-09-2016, 04:09 PM   #105
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Quote:
Originally Posted by JDCAVE View Post
If "On and Off" or toilet bowl cleaners or other acid product remove the stain, it's not tannins but something else. "Tannic acids" are neutralized and removed by basic products. Stains in stainless coffee carafes and teapots are typically removed by TSP or caustic soda. I suspect the brown stains on boats are iron oxides and are therefore most easily removed by oxalic or nitric acid.


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It's tannin here in the South. Or perhaps a combination.

"Color may also be affected by the concentration of natural dissolved organic acids such as tannins and lignins, which give water a tea color."

http://www.swrcb.ca.gov/water_issues...dance/3159.pdf
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Old 07-09-2016, 06:12 PM   #106
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Are mustaches only common on white/light-colored hulls? Never had an issue with my dark-hulled boat. But neither did my Dad in the polluted 1960s SF Bay with his egg-shell colored sailboat used in salted water. Is it a fresh-water issue?
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Old 07-09-2016, 06:25 PM   #107
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Are mustaches only common on white/light-colored hulls? Never had an issue with my dark-hulled boat. But neither did my Dad in the polluted 1960s SF Bay with his egg-shell colored sailboat used in salted water. Is it a fresh-water issue?
It obviously gets on a dark hull. Just rather hard to see.

Over in SW FL we got the stain more during rainy season and when running in the rivers or areas near the rivers. So in some sense it is a fresh water issue there.
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Old 07-09-2016, 08:26 PM   #108
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I get the stain way more when I go through the Fraser river flow, in crossing between Vancouver and the Gulf Islands. If I go Gabriola Pass or Porlier Pass it is way less than if I go Active Pass, as taking the latter route I have to run up Georgia Strait past Sandheads, and sit in Fraser River water for a couple of hours. On the other routes, I only get a little time in Fraser water off the North Arm jetty.

If I clean up after I arrive in the Gulf Islands, it does come back, but more slowly.

So fresh water seems to have a lot to do with it.
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Old 07-19-2016, 10:36 AM   #109
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Fresh water stahce . I guess I should clean it up while out .
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