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Old 10-30-2015, 07:09 AM   #1
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10yr Barnacle removal

My friends boat hasn't been hualed in probably 10+ yrs, I've never seen a boat so encrusted so to speak. Aside from needing a permit from the EPA to destroy an underwater eco-system what special steps should be taken when he hauls at our local yard ? I've heard spraying with muriatic acid helps in removal but I highly doubt a yard will let him do that as it hangs in the travel lift slings...Thanks
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Old 10-30-2015, 07:17 AM   #2
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Scraper on ta long handle for the paint areas...powe washer should get most...if it is a good one with the right tip.


Scraper on the underwater metals then acid if necessary...put a tarp under if marina balks.
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Old 10-30-2015, 08:50 AM   #3
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Muratic Shouldn't be a problem since we dump it in our pools and go swimming in it. Acid Magic is a better choice, no fumes. There are several boats in my marina that have not left the dock or had the bottom scraped in easily a decade and every one of them does not seem to get any worse than mine gets in 4 months. On theirs it is clear that the growth has reached a certain point and stopped. Often wonder about that every time I walk by.
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Old 10-30-2015, 09:21 AM   #4
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You could have a diver scrape it before you haul it. Less mess to deal with once you're on the hard.
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Old 10-30-2015, 09:49 AM   #5
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Like Bill said, scrape it in the water. The fish will have a feast and the yard will appreciate it.
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Old 10-30-2015, 09:58 AM   #6
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A diver can't use the long, heavy scraper that a yard can. It is no problem for the yard to handle the removed barnacles. They do it every day.

It took almost an hour with a heavy scraper like is used for roofing removal to get most of the accumulated barnacles after 4-5 years off of my buddy's boat. He then scraped the remaining by hand and used muriatic acid to try and get the barnacle base off. He was partially successful.

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Old 10-30-2015, 03:16 PM   #7
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Old 10-30-2015, 05:30 PM   #8
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A diver can't use the long, heavy scraper that a yard can. It is no problem for the yard to handle the removed barnacles. They do it every day.

It took almost an hour with a heavy scraper like is used for roofing removal to get most of the accumulated barnacles after 4-5 years off of my buddy's boat. He then scraped the remaining by hand and used muriatic acid to try and get the barnacle base off. He was partially successful.

David
I have been told that it is crucial to get the barnacle base off. I used a sharp wood chisel to do it. Just pushing by hand, no hammers used! It worked quite well, but it is slow. Next time I think I'll use the chisel for a first pass (well, after pressure wash and scraper) and then try acid for the remaining bits of barnacle base. It might need another chisel or something afterwards, but I'm thinking the acid would loosen them a bit.
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Old 10-30-2015, 06:26 PM   #9
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I have been told that it is crucial to get the barnacle base off. I used a sharp wood chisel to do it. Just pushing by hand, no hammers used! It worked quite well, but it is slow. Next time I think I'll use the chisel for a first pass (well, after pressure wash and scraper) and then try acid for the remaining bits of barnacle base. It might need another chisel or something afterwards, but I'm thinking the acid would loosen them a bit.
Acid doesn't loosen them at all. But it will eat away the shell base left after you scrap away the main body.
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Old 10-30-2015, 06:59 PM   #10
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After 10 years, the least you can do is sing the barnacles "Happy Birthday" before turning them into fish food.
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Old 10-30-2015, 07:01 PM   #11
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My friends boat hasn't been hauled in probably 10+ yrs, I've never seen a boat so encrusted so to speak.
I'm still trying to figure this one out. Why? The boat must not have been abandoned, so it kind of boggles the mind as to why anyone would not have a bottom job, or at least a diver anyway, over a decade. Strange. Oh well. Not my business, I guess.
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Old 10-30-2015, 08:55 PM   #12
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I had just the opposite experience. 8+ years sitting at the dock and pretty much just the prop the rudder the chines and the bottom edge of the keel had barnacles. The rest of the hull was completely clear.

old man next to me hasnt had his defever cleaned in over 5 years he said.
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Old 10-31-2015, 12:04 AM   #13
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Needle scaler to the rescue. They work great on barnacles. Parks might let you use his...


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Old 10-31-2015, 06:43 AM   #14
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Flat bladed hoe (looks like a big chisel on a long wood handle) works very well. Get the angle right and just slide it down the hull. I'm sure this won't be the first encrusted hull the travel lift has hauled.

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Old 10-31-2015, 07:02 AM   #15
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A diver can't use the long, heavy scraper that a yard can.
Sure they can.

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It is no problem for the yard to handle the removed barnacles. They do it every day.
I don't know about where the boat in question lives; but here in the Bay Area ( and maybe in all of California), excessively fouled boats will get a hefty surcharge from the yard as the yard must have the fouling growth barreled-up and shipped off as hazardous waste, which costs them a bundle. 'Course, it's OK to scrape it off in the water before the boat is hauled- that's no problem. Go figure.
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Old 10-31-2015, 08:49 AM   #16
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I had to deal with huge barnacle growth this spring, due to shifting to much healthier waters. I found that scraping while still immersed worked lots better than waiting for the power wash to be finished and then scraping. That even though I was swimming to do the former and standing to do the latter. Maybe the open, live barnacles don't hold on as tight?
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Old 10-31-2015, 12:37 PM   #17
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I had to deal with huge barnacle growth this spring, due to shifting to much healthier waters.
Hmmm, interesting.
From where to where?
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Old 10-31-2015, 12:54 PM   #18
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Spray with chlorine bleach mixed 10% in water from a pump-up sprayer, then pressure wash and scrape. Apply on-and-off acid or muratic acid (vinegar also works) to dissolve any remaining barnacle shell bases while scraping them off. The longer you keep it wet after haul-out, the easier it is to remove. Let it dry just once and bio is much harder to get off the hull.

The bleach and acid applications just reduce the amount of elbow grease needed...good luck.
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Old 10-31-2015, 01:03 PM   #19
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Coal Harbour to Long Harbour
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Old 10-31-2015, 01:21 PM   #20
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Coal Harbour to Long Harbour
So, healthier water or more sun? Open moor vs boathouse?
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