cast iron keel coating - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 18 Old 02-14-2001 Thread Starter
Junior Member
 
Join Date: Feb 2001
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

My thanks to all the input. I have started grinding on the keel and it''s obvious that there will be small minute areas where I can''t get all the rust out thus requiring the etching for treating.I''m going to be working in small batches until I can get a good coating over everything.
Has anyone used Petit metal primer or petit rustlock steel primer?
I''m thinking that etching and then metal primer will allow me to get a coating on the new work as I progress and then epoxy over the primer on marm days.
jritchie is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 18 Old 02-14-2001 Thread Starter
Junior Member
 
Join Date: Feb 2001
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

cont: Using metal primer will allow me to grind, etch and prime one area. While the primer is drying[2hrs], I can move to another area and work.
I have reviewed the cold temp procedures from West Systems web site and it appears to be difficult to maintain proper epoxy working temperatures while working outside in the boatyard with limited facilities.
jritchie is offline  
Quote Quick Reply Share with Facebook
post #13 of 18 Old 02-15-2001
Member
 
Join Date: Jan 2001
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

Don''t forget the rust converter...any hardware store will have it. About the temp.; I''ve seen people put up tents around their boats and bring in propane or kerosene heaters, and as you can guess-----it works!!!......Rev.
munchimike is offline  
Quote Quick Reply Share with Facebook
post #14 of 18 Old 02-16-2001
Moderator
 
Jeff_H's Avatar
 
Join Date: Feb 2000
Location: Annapolis, Md
Posts: 7,150
Thanks: 6
Thanked 190 Times in 155 Posts
Rep Power: 10
     
cast iron keel coating

Reading you latest posts, I would suggest as a better alternative that once you gave gotten as much of the old filler off as you can, rent a sand blaster and blast the keel "white". I would at that point very quickly roll on a barrier coat. In my mind that would ideally be straight epoxy or an epoxy based primer. I would avoid any other primer except posibly a zinc rich epoxy or a coal tar epoxy if you intend to coat the keel with epoxy afterward.

I would try to coat the keel in one session since the "laps" between cured and new epoxy are not as waterproof as a single continuous layer.

Jeff
Jeff_H is offline  
Quote Quick Reply Share with Facebook
post #15 of 18 Old 02-16-2001 Thread Starter
Junior Member
 
Join Date: Feb 2001
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

Cost is the primary factor on this repair. i can grind and sand on the iron on my own but it is going to be small batch coatings until I get the whole keel coated.I checked on the different epoxy brands and it looks like there are compatibility issues.
jritchie is offline  
Quote Quick Reply Share with Facebook
post #16 of 18 Old 02-20-2001
Member
 
Join Date: Jan 2001
Posts: 33
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

Well maybe you should skip the epoxy. Do a rust conversion, that''ll take care of the sealing then just paint it with anti fouling. Next year you may need to do a touch up, but it''ll be done for now.
munchimike is offline  
Quote Quick Reply Share with Facebook
post #17 of 18 Old 02-20-2001 Thread Starter
Junior Member
 
Join Date: Feb 2001
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

Mike--the problem is that the keel has to be faired into the fiberglass above the keel. It looks like the ''dutch'' cast iron was not perfect coming out of the mold. It has a deep gouge on one side about 2 inches below the keel/hull seam. This was faired with fiberglas when they built the boat and only showed when I stripped the failed covering.
The keel is very close to the hull sides until you get about 2ft away from the bow then it varies up to an inch or more.
I found out today that Mas epoxies can be used with rustlock metal prep so I''m coating the keel with the metal prep then sand, dry!!!! and then rub in a coat of epoxy to keep the moisture out.
I checked out the boatbuilding.com site and that''s a good source to know about!
jritchie is offline  
Quote Quick Reply Share with Facebook
post #18 of 18 Old 03-03-2001 Thread Starter
Junior Member
 
Join Date: Feb 2001
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
cast iron keel coating

I found that the metal prep would not last more than a day before the rust would start again so I''m coating the metal prep with pettit#6980 primer to stop the rust. This is just temporary until warm weather starts but it allows me to grind on the keel and have it sanded and primed .
Rust forms very quickly in one area of the keel because of porosity in the cast iron.I ground out a small area but found that the minute air holes went into the cast iron more than an 1/8 of an inch. Thankfully it seems contained in a one squre foot area.
jritchie is offline  
Quote Quick Reply Share with Facebook
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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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



Similar Threads
Thread Thread Starter Forum Replies Last Post
Fixed or swing keel, which is better? TimG2 General Discussion (sailing related) 17 07-30-2014 09:23 AM
Fin Keel or Shoal Keel acmecoyote General Discussion (sailing related) 11 05-06-2011 04:39 PM
Keel Anxiety! Spang Boat Review and Purchase Forum 8 06-19-2006 03:09 PM
Short Keel vs Normal SEAJM General Discussion (sailing related) 1 03-12-2003 02:13 AM
Iron Keels mogul11 Boat Review and Purchase Forum 3 07-08-2002 03:36 AM

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