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23-06-2018, 08:23
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#1
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Registered User
Join Date: Oct 2016
Location: Tampa Bay, FL
Posts: 349
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Removing Oyster Residue From Hypalon
I'm really angry at myself for this but I left the dinghy in the water for about two weeks and a shocking amount of oysters grew on the bottom. My marina is some kind of petri dish for explosive oyster growth this time of year.
I was able to knock off most of the growth with a plastic scrapper but there's still a good bit of hard oyster residue on the tubes. Any thoughts on how to remove this without damaging the dinghy?
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23-06-2018, 08:36
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#2
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Registered User
Join Date: Mar 2007
Location: Santa Cruz
Boat: SAnta Cruz 27
Posts: 6,683
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Re: Removing Oyster Residue From Hypalon
Muriatic acid should do the trick. Try a small test patch, and wear PPE.
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23-06-2018, 08:48
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#3
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Removing Oyster Residue From Hypalon
I’d dilute the acid about 50% myself.
You can try vinegar, rid Lyme, barnacle buster etc. but I think they are all one form or another of acid, different strengths and prices of course.
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23-06-2018, 09:27
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#4
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Registered User
Join Date: Oct 2016
Location: Tampa Bay, FL
Posts: 349
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Re: Removing Oyster Residue From Hypalon
I was considering muratic acid but was worried about it eating the fabric and glue joints.
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23-06-2018, 10:11
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#5
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Removing Oyster Residue From Hypalon
I don’t think it will affect it, but that is just a guess, and I won’t be the one to pay if it does of course.
I’d assume that is why Don said try a test patch and watch to see.
It would be the glue that would concern me the most. I think Hypalon is about as reactive as Viton, little exaggeration maybe.
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23-06-2018, 10:19
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#6
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Registered User
Join Date: Apr 2009
Location: CT
Boat: C&C 34
Posts: 1,045
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Removing Oyster Residue From Hypalon
Quote:
Originally Posted by WSMFP
I'm really angry at myself for this but I left the dinghy in the water for about two weeks and a shocking amount of oysters grew on the bottom. My marina is some kind of petri dish for explosive oyster growth this time of year.
I was able to knock off most of the growth with a plastic scrapper but there's still a good bit of hard oyster residue on the tubes. Any thoughts on how to remove this without damaging the dinghy?
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Over time the growth will degrade and become more brittle. Then you can scrape it off.
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23-06-2018, 14:42
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#7
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Registered User
Join Date: Oct 2016
Location: Tampa Bay, FL
Posts: 349
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Re: Removing Oyster Residue From Hypalon
Just to report back muratic acid worked great with zero noticeable impact to the fabric or glue. Mixed it about 50/50 with water. Took about two hours with two people working with brillo pads. Spray it on and let it sit for about 5 minutes and then scrub. Went from 3/4 inch of solid growth to looking brand new.
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23-06-2018, 14:56
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#8
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Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
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Re: Removing Oyster Residue From Hypalon
Do you still have skin on your finger tips?
Glad to hear that it worked, mind if I ask the brand name of the dinghy?
One day someone else will have the same problem and may search and find this thread.
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23-06-2018, 15:14
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#9
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Registered User
Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 4,864
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Re: Removing Oyster Residue From Hypalon
If you mix acid solution with flour to make a paste, you can just coat it on, cover with some plastic to retard evaporation and then scrub off half an hour later. I use a vinegar and flour poultice to clean my prop (when out of the water) and it works great.
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23-06-2018, 15:26
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#10
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Registered User
Join Date: Sep 2010
Location: Land of Disenchantment
Boat: Bristol 47.7
Posts: 5,607
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Re: Removing Oyster Residue From Hypalon
I have an Achilles dinghy made of Hypalon. The manual says it's OK to use acetone and I have with no ill effects. Haven't had the need to try any acids as of yet.
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23-06-2018, 15:44
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#11
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Registered User
Join Date: Oct 2015
Posts: 2,007
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Re: Removing Oyster Residue From Hypalon
Quote:
Originally Posted by Exile
I have an Achilles dinghy made of Hypalon. The manual says it's OK to use acetone and I have with no ill effects. Haven't had the need to try any acids as of yet.
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Acetone will have NO effect on oyster residue.
Try Barnacle Buster. It is a phosphoric acid cleaner made for this stuff. Much gentler than muriatic acid.
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23-06-2018, 16:09
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#12
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Registered User
Join Date: Sep 2010
Location: Land of Disenchantment
Boat: Bristol 47.7
Posts: 5,607
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Re: Removing Oyster Residue From Hypalon
Quote:
Originally Posted by billknny
Acetone will have NO effect on oyster residue.
Try Barnacle Buster. It is a phosphoric acid cleaner made for this stuff. Much gentler than muriatic acid.
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Thanks! Yeah, I think I read somewhere that Rydlyme, for e.g., was muriatic acid, so much stronger than phosphoric. But no, I wasn't using the acetone for oyster residue but some less onerous stains. Good to know about BB.
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23-06-2018, 16:57
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#13
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Registered User
Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,653
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Re: Removing Oyster Residue From Hypalon
Quote:
Originally Posted by billknny
Try Barnacle Buster. It is a phosphoric acid cleaner made for this stuff. Much gentler than muriatic acid.
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Very little phosphoric and a lot of water sold at great expense.
Salt water pool filter cleaner is same dilution for a lot less $
Better still, buy phosphoric and add your own water.
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23-06-2018, 16:59
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#14
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Registered User
Join Date: Jun 2016
Location: Australia
Boat: Milkraft 60 ex trawler
Posts: 4,653
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Re: Removing Oyster Residue From Hypalon
Quote:
Originally Posted by Exile
Thanks! Yeah, I think I read somewhere that Rydlyme, for e.g., was muriatic acid,.
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Muriatic and a lot of water.
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23-06-2018, 17:34
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#15
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Registered User
Join Date: Sep 2010
Location: Land of Disenchantment
Boat: Bristol 47.7
Posts: 5,607
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Re: Removing Oyster Residue From Hypalon
Good to know.
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