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Has anyone ever had problems with osmosis occurring
from the inside of the boat because of the water tank?
With best regards,
Sailing Vessel -
Cream Puff - SM2K - #275
- Tahiti, French Polynesia
On 3/23/2022 11:56 PM, James Alton via
The gelcoat in our water tank has some checks in it and
is in places flaking away. In general, if your boat is one of
those that is developing blisters elsewhere such as the
bottom, then I would consider epoxy sealing the inside of the
tank, and yes it would be a pretty horrible job as part or all
of the top of the tank would need to be cut away for access!
If your boat is blister free as ours is I would just do a
good clean up on the tank and vacuum out any loose chips, if
the laminate were blister prone you would see them by now. I
don't understand the reason for painting the keel bolts/nuts.
Unlike steel, stainless/Inox needs to be exposed to O2 in
order to develop the oxide to protect itself.
From: Kimberly Bunch via groups.io
Sent: Thu, Mar 24, 2022 11:05 am
Subject: [AmelYachtOwners] Water tank gelcoat
Anyone has any experience and/or advices about the
gelcoat cracking inside the water tanks of our Maramu?
We had to dry the tank in order to treat and paint the
keel bolts. Next day, as the paint was drying, the walls
of the tanks which had already a few cracks were
cracking and flecking in many places. Is it bad? Can it
present a risk to the fiberglass now exposed to the
water in the tank? Are we going to have osmosis in the
Sanding the gelcoat where it is flecking seems
Any advice would be greatly appreciated