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Go Back   SailNet Community > On Board > Gear & Maintenance > Hull Delamination
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Thread: Hull Delamination Reply to Thread
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Topic Review (Newest First)
01-04-2011 08:54 PM
paulk We had a similar sized issue & fix with the starboard quarter on our 1981 balsa-cored J/36. I attacked it from the inside and was able to use gravity instead of vacuum-bagging to hold everything together. Messy and time-consuming, but only about $200 of materials.
01-04-2011 01:05 PM
mitiempo The surveyor should have stated whether it was cored or not. If not it would have to be a big hit I think to cause delamination.
01-04-2011 12:52 PM
runfast The boat is a 1978 c&C 29 mk 1. I'm not sure if the hull on these is balsa cored or not.
01-04-2011 07:56 AM
pdqaltair I repaired a large area (15 ft2) area on a boat that got bruised by a stand and had damaged core, but only minor damage to either skin.

* Popped it out and repaired the damage to the outer skin. Very minor, just a little grinding and laminating. Easy to fair.
* Stripped the core from the inside and vacuum-bagged new core and inner skin. Not fair as glass, but about like original and hidden under the floor (but open for inspection). Fortunatly there were no bulkheads in the area (which, of course, is why it dented--incorrect blocking by the yard).

I used the boat hard for another 12 years and then sold her. Never a hint of a stress crack through the paint. Probably took about 15 hours of labor and $200 in material. The insurance gave me a check for $5,000!

Core replacement is not difficult. It takes good FRP skills and a plan. I was lucky in that the damage was under the bottom paint and I did not ave to match topsides; that is the labor intensive part, to me, unless you are refinishing the boat anyway. Of course, if the alternative is scrap, a quick coat of pain below the rail is not so hard.
01-04-2011 07:17 AM
boatpoker What size and model and year is your C&C ? Most C&C's had balsa cored hulls which is an entirely different issue.
01-04-2011 02:09 AM
runfast My boat is a late 70's C&C built in the US. The hull showed a soft spot under the slings in the port quarter when it was hauled last year, and a surveyor diagnosed the problem. Also found a soft area in the starboard bow, and some gelcoat cracks elswhere suggesting the problem may be more widespread. Issues have been above the water line.
01-03-2011 11:09 PM
mitiempo He hasn't posted for 2 years so I doubt he is around here to read this.

What kind of boat do you have and how serious is the damage?
01-03-2011 09:53 PM
runfast Interesting thread. I just found out from a survey that my boat has developed hull delamination issues. Repair by skinning the hull is cost prohibitive for a 30' boat that is 32 years old. Fastforward26, did you find a repair option?
09-16-2008 11:13 AM
knuterikt Hi
I have never tried this but its worth considering.

When bulding new boats vacuum infusion are becoming more popular it is a effective and inexpensive way to distrubute resin in a laminate.
You could do it the same way.

Drill some injection holes at the centre of the damaged area and holes for vacuum at the edges.

Apart from epoxy (or polyester) you will need plastic film, tape , hoses and a vacuum pump. If you google "vacuum infusion" you will get lots of hits.

The vacuum pump is the most expensive equipment. I have read som articles on using an old compressor from a fridge for this purpose. Or maybe you could by or rent one?

Just an idea

A boat repair shop close to my waters have recently started to look at vacuum infusion for repairjobs. (Don't know if they would use it to solve delamination thoug)
09-16-2008 08:16 AM
fastforward26 The insurance has been settled and satisfactorly. Still the question remains, what is it worth to repair a 25 year old hull? I've had a professional quote of nearly $10,000.00 A replacement boat can be bought for far less. That said, it's hard thing to throw away. Thanks again to all for the imput.
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