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04-11-2011, 18:24
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#1
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Registered User
Join Date: Apr 2011
Location: Severna Park, Maryland
Boat: Dufour 27
Posts: 17
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Suggestions for Removing Barnacles from a Bronze Propeller
Hello,
I will appreciate your suggestions for cleaning a heavily fouled bronze propeller.
I have a two blade folding Flex-O-Fold standard propeller that did a great job of attracting barnacles over the last two years. Fortunately when the marina hauled the boat last week for the winter they got the actual barnacles off the prop but it is still covered with their remains, lots of little raised white circles.
I wrote to Flex-O-Fold for advice and they cautioned me to avoid scratching the blade’s surface and they suggested that I clean it with the same kind of acid you use to clean your coffee machine; well I clean my coffee pot in the dishwasher. If you have overcome this situation I will sincerely appreciate your suggestions.
Thanks
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04-11-2011, 19:00
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#3
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Resin Head
Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,205
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Re: Suggtestions for removing Barnacles from a Bronze Propeller
A scraper followed with scotchbright. Or a scotchbright roloc pad on a pneumatic die grinder. Wonder why they are so worried about scratching, probably just CYA, so you dont take a grinder to it.
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04-11-2011, 19:05
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#4
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Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
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Re: Suggtestions for removing Barnacles from a Bronze Propeller
I also wonder why the concern over scratching the prop, especially since I plan to purchase a Flexofold. Cannot think of any reason why not to use a scraper or putty knife followed by polishing with fine grit sandpaper. That's what I have done for years with standard fixed blade props and so far none of my boats have exploded or had the prop shaft fly off.
Maybe ask Flexofold why the caution?
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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04-11-2011, 19:20
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#5
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Registered User
Join Date: May 2004
Location: Cruising on the hook
Boat: 34’ Marine Trader
Posts: 752
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Re: Suggtestions for removing Barnacles from a Bronze Propeller
Quite by accident I discovered that Ospho, a chemical used to treat rust on steel boats, works very well to remove the critters and their waste left behind.
__________________
Jim
We are what we repeatedly do.
Excellence, therefore, is not an act but a habit."
--Aristotle
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05-11-2011, 00:20
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#6
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Registered User
Join Date: May 2007
Location: New Zealand
Boat: Trismus 37
Posts: 763
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
I would assume Ospho is phosphoric acid, used on steel a 4 to 1 or 5 to 1 water to acid ratio is usual.
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05-11-2011, 00:32
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#7
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Registered User
Join Date: Aug 2010
Location: NSW Australia
Boat: Traditional 30
Posts: 1,980
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
Plastic scrapers work well- I used to use old peices of lexan with the a sharp edge ground into them. Metal scrapers could damage the bronze. Someone will correct me if I am wrong but the steel in normal paint scrapers is harder than bronze. any budding metallurgists speak up now.
__________________
Cheers
Oz
...............
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05-11-2011, 00:54
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#8
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Registered User
Join Date: Aug 2011
Location: Portishead UK
Boat: Dudley Dix Hout Bay 33
Posts: 139
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
I cleaned my heavily fouled prop this summer using diluted phosphoric acid as given to me by a professional boat mechanic. It worked really well and removed all growth completely. Finished off by buffing the blades with a polishing head on a grinder. Perfect result. One warning though - if your cradle is galvanised metal - do not allow the acid anywhere near it or it will remove the galvanising metal for sure.
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05-11-2011, 04:39
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#9
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
Coffee-makers are usually cleaned with Vinegar (Acetic Acid), or Citric Acid.
“CLR” is an acid based calcium, lime and rust remover.
➥ Jelmar | We Clean More Than You Think
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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05-11-2011, 04:40
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#10
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Registered User
Join Date: Jan 2009
Location: Catskill Mountains when not cruising
Boat: 31' homebuilt Michalak-designed Cormorant "Sea Fever"
Posts: 2,114
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
White vinegar is a cheap alternative. Acetic acid instead of phosphoric. Either way, it would be best if you could set up a soak system -- maybe a plastic bag attached to the prop, or a towel wetted out periodically.
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05-11-2011, 04:41
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#11
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
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Re: Suggtestions for removing Barnacles from a Bronze Propeller
Quote:
Originally Posted by boatman61
Try soaking it in two litres of Coca Cola.... works wonders on jewelery...
No affiliations... Honest...
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I think that you should either swim faster, or take your jewelry off before entering the water.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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05-11-2011, 04:48
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#12
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Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
Do not argue with using citric, acetic or other soakings and, if you can get the critters off with plastic certainly. But still don't see why not a steel scraper. Bronze is pretty hard and I have never gouged or even made deep scratches in a prop with a steel scraper. Certainly left scrapes and scratches and the prop didn't have a shiny mirror finish when I was done but then I've never seen a prop more that a year that did.
Still interested to hear why Flexofold recommends against scrapers.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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05-11-2011, 04:55
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#13
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Senior Cruiser
Join Date: Jan 2010
Location: PORTUGAL
Posts: 30,586
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Re: Suggtestions for removing Barnacles from a Bronze Propeller
Quote:
Originally Posted by GordMay
I think that you should either swim faster, or take your jewelry off before entering the water.
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ROFL.... Nice one Gord....
Actually its women who use this trick... several GF's over the years have....
And I figure something strong enough to remove human stomach lining should be good enough to break down barnacle mucus...
Never actually tried it... used to use a wooden wedge and vinegar/bleach myself...
__________________
It was a dark and stormy night and the captain of the ship said.. "Hey Jim, spin us a yarn." and the yarn began like this.. "It was a dark and stormy night.."
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05-11-2011, 05:43
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#14
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Registered User
Join Date: Jan 2009
Location: Catskill Mountains when not cruising
Boat: 31' homebuilt Michalak-designed Cormorant "Sea Fever"
Posts: 2,114
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
Quote:
Originally Posted by skipmac
Still interested to hear why Flexofold recommends against scrapers.
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I'm guessing they're just taking theory to a logical extreme. Scratches and burrs on your prop cause mini-turbulence and mini-cavitation, and eventually loss of prop efficiency. In the case of barnacle scrubbing, probably nothing you could measure. But they just want to steer you away from the possibility. . . .
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05-11-2011, 05:56
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#15
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
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Re: Suggestions for Removing Barnacles from a Bronze Propeller
NEVER mix bleach and vinegar!
In fact, you really shouldn’t mix bleach with anything (except water).
Mixing bleach and vinegar, or any acid, releases toxic chlorine gas.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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