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Old 23-06-2018, 08:23   #1
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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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Old 23-06-2018, 08:36   #2
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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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Old 23-06-2018, 08:48   #3
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Re: Removing Oyster Residue From Hypalon

Id 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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Old 23-06-2018, 09:27   #4
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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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Old 23-06-2018, 10:11   #5
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Re: Removing Oyster Residue From Hypalon

I dont think it will affect it, but that is just a guess, and I wont be the one to pay if it does of course.
Id 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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Old 23-06-2018, 10:19   #6
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Removing Oyster Residue From Hypalon

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Originally Posted by WSMFP View Post
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?


Over time the growth will degrade and become more brittle. Then you can scrape it off.
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Old 23-06-2018, 14:42   #7
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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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Old 23-06-2018, 14:56   #8
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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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Old 23-06-2018, 15:14   #9
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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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Old 23-06-2018, 15:26   #10
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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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Old 23-06-2018, 15:44   #11
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Re: Removing Oyster Residue From Hypalon

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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.
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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Old 23-06-2018, 16:09   #12
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Re: Removing Oyster Residue From Hypalon

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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.
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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Old 23-06-2018, 16:57   #13
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Re: Removing Oyster Residue From Hypalon

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Try Barnacle Buster. It is a phosphoric acid cleaner made for this stuff. Much gentler than muriatic acid.
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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Old 23-06-2018, 16:59   #14
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Re: Removing Oyster Residue From Hypalon

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Thanks! Yeah, I think I read somewhere that Rydlyme, for e.g., was muriatic acid,.
Muriatic and a lot of water.
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Old 23-06-2018, 17:34   #15
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Re: Removing Oyster Residue From Hypalon

Good to know.
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