Are these blisters, cracks, or what? - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 

Like Tree1Likes
LinkBack Thread Tools
Old 08-09-2013
Join Date: Mar 2010
Location: SF - South Bay
Posts: 509
Thanks: 1
Thanked 10 Times in 10 Posts
Rep Power: 5
paul323 is on a distinguished road
Re: Are these blisters, cracks, or what?

boatpoker, you are correct, glass cannot rot...but from direct experience: I had to work on a boat with a compromised keel where there was a layer of black mush with fibres embedded in it that certainly looked "rotten" - clearly the remains of mat which was not fully whetted out. Possibly a batch of epoxy was improperly mixed, resulting in a "soft spot" too deep to show as a blister? Anyway, this was in an epoxy hull boat; I have less experience with polyester resins.

I *think* - and am more than willing to be corrected - that some roving is not 100% glass, but sometimes a glass/polyester mix. Also open to other suggestions.

So I a probably off base here, but the problem looked almost identical - and I stick to my hope it is a "false keel" problem!
Reply With Quote Share with Facebook
Old 08-10-2013
Senior Member
Join Date: Jan 2013
Location: Montreal, QC, Canada
Posts: 234
Thanks: 0
Thanked 11 Times in 10 Posts
Rep Power: 2
sony2000 is on a distinguished road
Re: Are these blisters, cracks, or what?

On the hard for a while, and she has purged herself of moisture. Great. Open up the crack, epoxy it closed. Done. Sell the boat.
If you want, and I maybe wrong, but then take advantage of the hulls dryness and put on a barrier coat all over it, for the next owner. Super.
Reply With Quote Share with Facebook
Old 08-10-2013
saildork's Avatar
Senior Member
Join Date: Feb 2007
Location: Huntsville, Alabama
Posts: 295
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
saildork is on a distinguished road
Re: Are these blisters, cracks, or what?

I had the same problem with my Caliber 33 which has an encapsulated keel. There was a crack in the bilge (bad repair job by a PO) that allowed water from above to leak down into the keel and eventually out through a spot low on the keel. I drilled out the spot where the water was seeping out, to find that it had undermined the concrete the builder had used to fill in the spaces around the iron billets used for ballast.

We started the repair with a temporary repair in the bilge to ensure no more water would pass through. (Also put a new mast boot on the mast at deck level).

On the keel, we ground out an area about 2 feet across, brushed out all the loose concrete, put a heat lamp on the area from early May until mid July. Then repaired the area using a rust encapsulating 'paint' on the exposed iron, filled with a hydraulic, vinyl concrete, laid up multiple layers of glass and faired out with epoxy. Then went back to the bilge, ground out the temporary repair, and effected a proper repair of the bilge with several layers of glass and epoxy.

Since these repairs were beyond my skill level, I paid the yard to do the work. Total cost was about $2500, of which $2000 was labor. The iron only rusted after it was exposed to open air, so rust was not an issue. As the water ran into the keel, it had followed the seam between the glass and the ballast, so the whole keel was not affected. So fear not; the problem you face is probably not catastrophic and cost of repair might not break your piggy bank. And odds are that, after repair, your boat will out live you and her next owner.
Sailing isn't a matter of life and death. It's much more important than that!
Reply With Quote Share with Facebook
Old 08-10-2013
SloopJonB's Avatar
Senior Moment Member
Join Date: Jun 2011
Location: West Vancouver B.C.
Posts: 10,616
Thanks: 56
Thanked 48 Times in 45 Posts
Rep Power: 4
SloopJonB will become famous soon enough
Re: Are these blisters, cracks, or what?

Looks like iron oxide weeping through a coating. Since you say you have an encapsulated keel, my money is on a leaking encapsulation.

I'd grind it open to see what I was dealing with.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
Reply With Quote Share with Facebook
Old 08-10-2013
Senior Member
Join Date: May 2012
Location: Lund British Columbia
Posts: 100
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 3
Bob142 is on a distinguished road
Re: Are these blisters, cracks, or what?

I would agree with the theory of ( punchings ) ...Problem becomes rust is on the order of seven times the volume of iron...
Desolation Sound
Maple Leaf 48

Any storm in a port...
Reply With Quote Share with Facebook
Old 01-22-2014
Junior Member
Join Date: Jan 2014
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
pforeman98 is on a distinguished road
Re: Are these blisters, cracks, or what?

The worst stains make me suspect an iron keel. Do you know what the keel ballast is.
Reply With Quote Share with Facebook

bilge , cracks , fiberglass , osmosis

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Blisters, yes another blisters thread johnnyandjebus Gear & Maintenance 7 10-24-2010 05:25 PM
Blisters Flfishindude O'Day 1 05-11-2010 08:40 PM
Gel Cracks on 309 Siamese Gear & Maintenance 4 09-30-2008 01:50 PM
Through the Cracks John Kretschmer Buying a Boat Articles 0 07-05-2004 08:00 PM
cracks on eck richb Boat Review and Purchase Forum 1 08-16-2001 01:47 PM

All times are GMT -4. The time now is 05:32 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

The store is owned and operated by a company independent of the forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.