Do I need to protect areas scratched on mast? - SailNet Community
 
LinkBack Thread Tools
post #1 of 6 Old 10-24-2012 Thread Starter
Member
 
Join Date: Aug 2003
Location: East Falmouth, MA
Posts: 61
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 12
 
Do I need to protect areas scratched on mast?

Hello,
I have a new-to-me Compac 19. The previous owner had tightened down the spreader sockets on the mast too tight. His work left this dimple:


What I've done is taped off the dimple and filled it with JB Weld. I'm now sanding the JB Weld so it is fair with the adjacent surfaces. The sanding has abraded the aluminum in a spot or two. Do I need to coat the aluminum in these places with some product to protect the mast from weathering/corrosion?
Thanks for your help.
Marc
marcberoz is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 6 Old 10-24-2012
Senior Member
 
rugosa's Avatar
 
Join Date: Aug 2011
Location: In a strange land
Posts: 578
Thanks: 1
Thanked 10 Times in 10 Posts
Rep Power: 4
 
Re: Do I need to protect areas scratched on mast?

You should insert an aluminum compression tube through the mast. You can get a tube to fit diameter of through-bolt, drill mast to match OD of tube, have it welded in. Tube length should be same as original outside mast dimension. JB Weld will bring spar back to fair but will not address the compression. Without you are facing spar failure. Scratches can be painted with aluminum compatible paint (zinc chromate primer first), or a clear lacquer. We try to wax entire spar annually too.

BTW - is that a weld further up the spar? Might indicate a previous failure or repair.
rugosa is offline  
Quote Quick Reply Share with Facebook
post #3 of 6 Old 10-24-2012 Thread Starter
Member
 
Join Date: Aug 2003
Location: East Falmouth, MA
Posts: 61
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 12
 
Re: Do I need to protect areas scratched on mast?

No that's not a weld. Just some cellophane wrapped around the mast. As far as a compression tube, I was planning to use a nylon bushing. Drill one of the holes wide enough to accommodate the outside diameter of the bushing. The other end of the bushing would press against the inside wall of the mast. The bushing would allow me to tighten the bolt and nut. The spreader sockets would put load against the bushing and not the mast. All I need to do is have the bolt and its nut snug so that the spreader sockets don't wiggle about too much.

Thanks for info about the paint.
Marc
marcberoz is offline  
Quote Quick Reply Share with Facebook
post #4 of 6 Old 10-24-2012
Senior Member
 
rugosa's Avatar
 
Join Date: Aug 2011
Location: In a strange land
Posts: 578
Thanks: 1
Thanked 10 Times in 10 Posts
Rep Power: 4
 
Re: Do I need to protect areas scratched on mast?

Quote:
Originally Posted by marcberoz View Post
No that's not a weld. Just some cellophane wrapped around the mast. As far as a compression tube, I was planning to use a nylon bushing. Drill one of the holes wide enough to accommodate the outside diameter of the bushing. The other end of the bushing would press against the inside wall of the mast. The bushing would allow me to tighten the bolt and nut. The spreader sockets would put load against the bushing and not the mast. All I need to do is have the bolt and its nut snug so that the spreader sockets don't wiggle about too much.

Thanks for info about the paint.
Marc
As much as it is a small boat I'd still be careful about compression strength of nylon v aluminium. There is considerable compression load at rest and especially from windward under sail. Depending on spreader bases you might be able to bore them out, install aluminum (or stainless) compression tube with threaded ends (I'm thinking something like Navtang used on rod rigging) that will clamp spreader bases against mast and also address compression load from spreader. Check SN forums for older advise on same subject or consult a rigger. Masts are expensive to replace, especially if you have secondary damage to deck, boat, sails, crew.
rugosa is offline  
Quote Quick Reply Share with Facebook
post #5 of 6 Old 10-24-2012
Senior Member
 
Join Date: Feb 2012
Location: New Orleans Louisiana
Posts: 2,359
Thanks: 7
Thanked 83 Times in 79 Posts
Rep Power: 4
 
Re: Do I need to protect areas scratched on mast?

Marc,

The scratches are a non-issue.

The dimple is a potentially catastrophic one. Fairing it with JB weld is at best a cosmetic fix to a structual problem. It needs to be brought back to true, then a standard compression tube added. Nylon is not acceptable here, think aluminium or titanium (stainless if you have too).

Greg Rubin
Attorney
Stumble is offline  
Quote Quick Reply Share with Facebook
post #6 of 6 Old 10-24-2012 Thread Starter
Member
 
Join Date: Aug 2003
Location: East Falmouth, MA
Posts: 61
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 12
 
Re: Do I need to protect areas scratched on mast?

OK. You've convinced me to use a metal compression tube rather than nylon. I'll get more opinions about the mast integrity too.
Marc
marcberoz 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
How you protect your skin against the sun ? negrini Gear & Maintenance 23 12-16-2009 07:32 AM
What does the zinc protect davidpm Gear & Maintenance 18 06-16-2008 08:47 AM
scratched port lites scosch Gear & Maintenance 15 12-03-2007 10:53 PM

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