Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 15-08-2014, 22:45   #1
Registered User

Join Date: Aug 2010
Location: sydney, australia
Boat: 38 roberts ketch
Posts: 1,021
Images: 3
Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

I get in the water pretty regularly to clean up the prop, but so far I've been a bit reluctant to use the scrubbing broom on the scum on hull areas for fear of scraping off the antifoul and giving them damn crustaceans a better purchase on the hull afterwards - generally the hull areas away from prop/rudder etc are pretty clear of nasties at haulout but everytime i get in the water i want to have at the scum on the hull - whats the thinking on this?
__________________

__________________
charliehows is offline   Reply With Quote
Old 15-08-2014, 23:09   #2
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,385
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

What kind of paint? Ablative or hard? Divers clean bottoms all the time. You should be able to do so. Too.
__________________

__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is offline   Reply With Quote
Old 15-08-2014, 23:37   #3
Registered User
 
sapient sue's Avatar

Join Date: Jan 2014
Location: We are now waiting for a weather window to cross Bass Strait. Currently in Lakes Entrance and have enjoyed exploring the Gippsland Lakes.
Boat: Joe Adams Naut 40
Posts: 202
Images: 5
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

As Stu said it all depends on the paint. If you scrub ablative paint you won't have much left to keep the critters at bay. That is the way ablative paint works as it it wears away a new surface is exposed. Hard antifoul on the other hand can be scrubbed fairly vigorously. It also depends on where you are located, cooler water versus the tropics and length of time between haul outs as to how hard to scrub. So how long is a piece of string?

Sapient Sue
__________________
sapient sue is offline   Reply With Quote
Old 16-08-2014, 08:54   #4
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

At $330 per gallon for ablative its not a dumb question at all!

I see folks scrubbing away in a cloud of blue or red water. Its crazy unless you want to haul each season and are racing.

Keep the prop clean as you do and let the goobies build up on you antifoul but knock off any barnacles.

Divers clean boat all the time, they are contracted to CLEAN the bottom, they are not contracted to save your antifouling.

My boat takes 3 gallons at $330 per gallon with the idea I have a few extra coats on the leading edges. Thats a lot of money to go rub off with a $1 green kitchen scourer.
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 16-08-2014, 09:21   #5
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

Less dependent on paint type and more dependent on how foul you've let the bottom become and what you use to remove the fouling growth. People who claim that cleaning your hull is bad for the paint don't know what they are talking about. Sure, if you wail away at the bottom with a scraper or abrasive scrubber, you will damage or remove paint. But gentle cleaning with the proper tools will actually extend the life of your anti fouling paint, not shorten it. Clean your bottom while it can still be done with carpet or a white pad. Don't wait until you have to literally scrape the growth off. In the Bay Area for instance, a quality paint cleaned 6 times per year will perform well for 3+ years and stay relatively clean between services (meaning better performance under both power and sail) to boot.
__________________
fstbttms is offline   Reply With Quote
Old 16-08-2014, 09:25   #6
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,045
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

I was under the impression you wanted to clean ablative paint, that that was what kept it working, removing the old paint layer and exposing a fresh one? Of course eventually you have nothing left if you keep removing it
__________________
a64pilot is offline   Reply With Quote
Old 16-08-2014, 09:36   #7
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

Quote:
Originally Posted by a64pilot View Post
I was under the impression you wanted to clean ablative paint, that that was what kept it working, removing the old paint layer and exposing a fresh one? Of course eventually you have nothing left if you keep removing it
If your bottom gets foul, it needs to be cleaned regardless of what type of anti fouling is on it. Ablatives are no exception.
__________________
fstbttms is offline   Reply With Quote
Old 16-08-2014, 09:44   #8
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 17,045
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

OK stupid question, but if hard paint worked well, then it would last for years, as in much longer than abalative?
I only have experience with ablative
__________________
a64pilot is offline   Reply With Quote
Old 16-08-2014, 09:51   #9
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

Ablatives do tend to be somewhat shorter-lived than hard paints. This is due to the way they work, which is by "ablating" away (much like a bar of soap) as the boat moves thru the water. That said, with any paint, once the biocide is depleted, the paint becomes ineffective. This typically occurs after 2-3 years, depending on biocide leach rate etc.
__________________
fstbttms is offline   Reply With Quote
Old 16-08-2014, 15:27   #10
Registered User

Join Date: Aug 2010
Location: sydney, australia
Boat: 38 roberts ketch
Posts: 1,021
Images: 3
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

ablative. temperate zone. I get barnacles in the area around the skeg,prop and rudder but relatively few elsewhere - my main concern is, yes, wiping off the $100's of antifoul that i so laboriously applied at haulout.
__________________
charliehows is offline   Reply With Quote
Old 16-08-2014, 16:22   #11
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: Dumb Question; How Much Damage Does Hand Scrubbing Do To Antifoul?

Quote:
Originally Posted by charliehows View Post
I get barnacles in the area around the skeg,prop and rudder but relatively few elsewhere - .
Yeah, I'd just gently tap them off.

Any slime is going to come off when you go for a sail as the paint ablates, or its not going to slow you down much anyway. Slime may even speed you up


If you are racing its maybe a different story, but for cruising the slime wont hurt but the barnacles may slow you a bit. Coral will slow you a lot so when you start getting that you know its time for a haulout.

__________________

__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
are "dumb" questions dumb, or ... sailorboy1 Our Community 27 20-11-2013 07:53
Deck scrubbing - alts to doing it by hand ? macbeth Construction, Maintenance & Refit 21 22-06-2013 17:26
bottom paint - antifoul - the annual question of cost krissteyn Europe & Mediterranean 2 07-04-2013 05:21
How much damage (by others!) would you accept as just expected wear & tear? David_Old_Jersey Dollars & Cents 12 20-12-2012 14:33
Colour of Antifoul - Does it Matter ? Lagoon4us Construction, Maintenance & Refit 21 02-03-2012 21:02



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:58.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.