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Surface of bilge cracking/crumbling

Feb 17, 2021
oday 1978 25 burrard civic
Hi everyone! I have a 1978 25 foot Oday. I’ve had her for two years and it’s been great and I’ve been learning so much! I’ve noticed that the surface/substrate of my bilge is cracking/crumbling. I’m planning to pull her out next month and will have someone come and take a look at it, but I was wondering if any of you have encountered this? I’m not sure what this material is that is cracking. Not sure if it original or was done by a previous owner.


Feb 21, 2013
Hunter 46 Point Richmond, CA
Welcome to the forum!!

Your plan to have a qualified boat contractor look at it is good and I would be prepared to to remove the surface cracks and re-glass it.
Jan 24, 2017
Hunter 34 Red Bank NJ
welcome to the forum,

lots great info and helpful fellow sailors here.
Looks like some water saturation between the Fiberglas resins and layers of Fiberglas has delaminated. I had similar issue, not as much as your pictures.
doesn't apear to be structural,

Do you keep boat in climates where temperatures get below freezing?
My issue I believe was caused by ice that expanded where the water infiltrated the layers of glass.

I think that all you need to do is scrape away to lose chips, clean with good solvent, then mix up some thickened epoxy and fill in any voids and give area good Côte of epoxy. After area has been given a good Côte and drys then paint with bildge Côte paint.

Did mine about twenty years ago, no issues.
If you are in a freeeze zone put a splash of antifreeze in the bildge in the winter,
I've been doing this for years and never had any issues sense.

Hope this helps.
May 24, 2004
CC 30 South Florida
Like the Cap says it is likely water that infiltrated the fiberglass, froze and expanded cracking the glass. Before repairing I would check the holding of the keel bolts.