Cleaning algae off the hull - SailNet Community
 7Likes
Reply
 
LinkBack Thread Tools
post #1 of 16 Old 03-31-2020 Thread Starter
Member
 
Join Date: Dec 2016
Posts: 33
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Cleaning algae off the hull

What’s the best way to clean algae off the hull of my boat?

Powerwash isn’t an option for me.

Pictures attached.
Attached Thumbnails
42474D62-65F6-44F8-AA2C-0643C0D437E0_1585704795053.jpeg  
hildamman is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 03-31-2020
Senior Member
 
SchockT's Avatar
 
Join Date: May 2012
Location: North Vancouver, BC
Posts: 2,268
Thanks: 4
Thanked 54 Times in 51 Posts
Rep Power: 9
 
Re: Cleaning algae off the hull

Quote:
Originally Posted by hildamman View Post
What’s the best way to clean algae off the hull of my boat?

Powerwash isn’t an option for me.

Pictures attached.
Assuming that is gelcoat you can just use a green scrubbing pad. Looks like you are due for a good polish anyway

Sent from my SM-G960W using Tapatalk

2011 Jeanneau 39i Azura
SchockT is online now  
post #3 of 16 Old 03-31-2020
Senior Member
 
chef2sail's Avatar
 
Join Date: Nov 2007
Location: Maryland
Posts: 11,662
Thanks: 132
Thanked 248 Times in 240 Posts
Rep Power: 13
 
Send a message via AIM to chef2sail
Re: Cleaning algae off the hull

Wiping with a green cloth...last use FSR....will also take most of the wax off

https://www.amazon.com/FSR-Davis-Fib.../dp/B0171Q13ZG


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
___________________________
S/V Haleakala (Hawaiian for" House of the Sun")
C&C 35 MKIII Hull # 76
Parkville, Maryland
(photos by Joe McCary)
Charter member of the Chesapeake Lion posse

Our blog-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


“Sailing is just the bottom line, like adding up the score in bridge. My real interest is in the tremendous game of life.”- Dennis Conner
chef2sail is online now  
 
post #4 of 16 Old 03-31-2020
Junior Member
 
Join Date: May 2015
Posts: 16
Thanks: 6
Thanked 1 Time in 1 Post
Rep Power: 0
 
Re: Cleaning algae off the hull

2 jars of elbow grease
capta and Whalerus like this.
jb cruzan is offline  
post #5 of 16 Old 04-01-2020
Sailor
 
Gladrags1's Avatar
 
Join Date: Apr 2003
Location: Rock Creek, Maryland
Posts: 922
Thanks: 13
Thanked 39 Times in 39 Posts
Rep Power: 18
 
Cleaning algae off the hull

I would suggest using MEK and some scrubbing when necessary and avoid acid washes which end up making the gelcoat more porous. The stains occur because the algae gets into the pores and live there. Once you’ve removed the stains with MEK you can use a mild to medium grit polishing paste to close the pores even more. Then apply 3M’s Scotchguard Polish for year long protection and your stains will wipe off with a sponge. It worked for my 30 year boat.
olson34 likes this.

Mandolin
Bayfield 36
Sailing out of Rock Creek, Chesapeake Bay
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Gladrags1; 04-01-2020 at 07:15 AM.
Gladrags1 is offline  
post #6 of 16 Old 04-01-2020
Senior Member
 
colemj's Avatar
 
Join Date: Jul 2003
Location: On the boat cruising
Posts: 3,584
Thanks: 5
Thanked 153 Times in 145 Posts
Rep Power: 17
 
Re: Cleaning algae off the hull

This: https://www.walmart.com/ip/MaryKate-...glass/33706365

Just brush it on and watch it disappear.

Mark

Dolphin 460 Catamaran "Reach"

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Current boat

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Previous boat
colemj is offline  
post #7 of 16 Old 04-01-2020
Senior Member
 
Join Date: Jul 2007
Location: Philadelphia
Posts: 1,312
Thanks: 0
Thanked 23 Times in 22 Posts
Rep Power: 13
 
Re: Cleaning algae off the hull

Stiff brush and buckets of dish detergent soapy water. Then wash the soap off with clean water.

1970 Havsfidra 20 by Fisksatra
On the Delaware River at Fox Grove Marina Essington PA
Ulladh is offline  
post #8 of 16 Old 04-01-2020
Senior Member
 
Join Date: Aug 2010
Location: The Bahamas
Posts: 4,308
Thanks: 4
Thanked 164 Times in 162 Posts
Rep Power: 10
 
Re: Cleaning algae off the hull

You can buy oxalic acid crystals dirt cheap.
Mix in water
Wear gloves and watch magic occur
RegisteredUser is online now  
post #9 of 16 Old 04-01-2020
Senior Member
 
colemj's Avatar
 
Join Date: Jul 2003
Location: On the boat cruising
Posts: 3,584
Thanks: 5
Thanked 153 Times in 145 Posts
Rep Power: 17
 
Re: Cleaning algae off the hull

Oxalic acid will remove the stain very well, but won't remove the algae itself. The On/Off I linked to contains hydrochloric and phosphoric acid, which will dissolve and remove the algae.

No need for elbow grease or scrubbing. It will remove wax, but that isn't a concern by the time the hull looks like that picture.

Mark
sailingfool and capta like this.

Dolphin 460 Catamaran "Reach"

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Current boat

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
- Previous boat
colemj is offline  
post #10 of 16 Old 04-01-2020
Master Mariner
 
capta's Avatar
 
Join Date: Jun 2011
Location: somewhere south of civilization
Posts: 8,111
Thanks: 181
Thanked 426 Times in 414 Posts
Rep Power: 9
 
Re: Cleaning algae off the hull

The green 3-M pads are like sandpaper. I wouldn't suggest using those on your hull. The On&OFF will do the job for the most part, but since it is a combination of a couple of pretty corrosive acids, use EYE protection as well as gloves.
Otherwise, a good brush and soapy water will certainly do the trick with those jars of elbow grease mentioned above. This actually might be the best option if you are in lockdown as most of us are, and could use the exercise. lol
olson34 likes this.

"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.
“Believe me, my young friend, there is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.” ― Kenneth Grahame, The Wind in the Willows

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

facebook.com/svskippingstone
capta is online now  
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome