Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 29-07-2020, 08:12   #1
Registered User

Join Date: Jul 2020
Posts: 2
Steel Hull corrosion

I have a steel hull boat with a full keel. I just bought her and painted her but I had a difficult time painting under her keel. A man at the local marine supply shop told me I didn't need to put an epoxy primer on her, so I didn't. I just sanded her and painted her bottom side.

There were two places under the keel that I could not get to because the boat had two wooden blocks under her while on the hard. I'm concerned about these areas and under the keel in general.

Do I need to worry about bottom growth and corrosion under the keel? Can I afford to keep her in the water a few more months or should I pull her out and fix it right away?

Thanks for your help.
PasosLargos is offline   Reply With Quote
Old 29-07-2020, 08:23   #2
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: 4,257
Re: Steel Hull corrosion

In short, I think you got some bad dope from the guy at the marine supply shop. You definitely wanted to have a barrier coat everywhere and yes, corrosion and fouling are likely going to be issues in the unpainted spots.
fstbttms is offline   Reply With Quote
Old 29-07-2020, 08:55   #3
Registered User
 
grantmc's Avatar

Join Date: Jul 2013
Location: Wellington, NZ and Fiji
Boat: Reinke S10 & Raven 26
Posts: 586
Send a message via Skype™ to grantmc
Re: Steel Hull corrosion

What fstbttms said. But also the spots on the blocks need to be painted. No urgency, a few months won't hurt. So need to stress.
Normally I would be on hand with anti foul paint and brush when the boat is getting lifted to return to the water. And I paint the obscured spots then. Yard staff are used to people doing that. And the paint stays on in the water.
Some people go the extra mile and have the boat moved slightly. This may cost an extra lift.
__________________
Grant Mc
The cure for everything is salt water: sweat, tears or the sea.
grantmc is offline   Reply With Quote
Old 29-07-2020, 09:02   #4
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: 4,257
Re: Steel Hull corrosion

Quote:
Originally Posted by grantmc View Post
Normally I would be on hand with anti foul paint and brush when the boat is getting lifted to return to the water. And I paint the obscured spots then. Yard staff are used to people doing that. And the paint stays on in the water.
Yes unfortunately, paint requires exposure to air to cure properly and when you splash a boat that has wet paint, that doesn't happen.
fstbttms is offline   Reply With Quote
Old 29-07-2020, 09:02   #5
Registered User

Join Date: Jul 2020
Posts: 2
Re: Steel Hull corrosion

Quote:
Originally Posted by fstbttms View Post
In short, I think you got some bad dope from the guy at the marine supply shop. You definitely wanted to have a barrier coat everywhere and yes, corrosion and fouling are likely going to be issues in the unpainted spots.
The boat already had a coat or two of primer and paint from years past. I'm not sure if that will help though.
PasosLargos is offline   Reply With Quote
Old 29-07-2020, 11:03   #6
Registered User

Join Date: Aug 2009
Location: between the devil and the deep blue sea
Boat: a sailing boat
Posts: 20,059
Re: Steel Hull corrosion

I always use epoxy on steel, before I apply any paint.


The blocks are moved either by lifting the boat on a jack, or else on a travelift.


b.
barnakiel is offline   Reply With Quote
Old 29-07-2020, 23:18   #7
Registered User

Join Date: Apr 2007
Location: Australia
Boat: Island Packet 40
Posts: 4,033
Images: 7
Re: Steel Hull corrosion

Happens all the time and provided you have anodes on the hull it does not cause corrosion problems.

Provided the bottom plate is pretty solid you can minimize the area affected by making up a couple of triangular stands by welding a piece of 4" X 4" X 3/8" angle iron onto a piece of plate. needs to be long enough to extend outside the keel on both sides.
RaymondR is online now   Reply With Quote
Reply

Tags
corrosion, hull, steel, steel hull

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Stray- Current Corrosion, or Galvanic Corrosion, or?????...Help sailcrazy Electrical: Batteries, Generators & Solar 46 25-03-2019 21:35
Stainless steel shackle corrosion stillbuilding Deck hardware: Rigging, Sails & Hoisting 34 09-10-2018 12:56
Is having a steel rudder inviting galvanic corrosion? Privilege Electrical: Batteries, Generators & Solar 14 03-06-2016 21:25
Does Stainless Steel Finish Matter For Corrosion Protection Or Anything Else ? rebel heart Construction, Maintenance & Refit 24 18-02-2014 10:03
Aluminum Hull or Steel Hull ? Lt. Monohull Sailboats 13 30-10-2011 12:55

Advertise Here


All times are GMT -7. The time now is 03:22.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.