Painted light into the cabin.

[STATUE]

My Atalanta 26 has what we call a 'blister' (coachroof) , looks like half an Easter egg stuck on the deck. I had applied several coats of Le Tonkinois oil based varnish on the 'blister' .

Inside I painted it with SML primer and matt white.

Last winter I failed to put the boatcovers on (Another story for another day!).

As a result rain did penetrate the roof and the inside matt white has all peeled off

What should I do with the inside of the blister now ?

I have in the last week taken the outside of the blister back to bare wood and intend to coat/s with Le Tonkinois as I have before.

All guidance will be gratefully received.

 

[Rum Run]

My Atalanta 26 has what we call a 'blister' (coachroof) , looks like half an Easter egg stuck on the deck. I had applied several coats of Le Tonkinois oil based varnish on the 'blister' .

Inside I painted it with SML primer and matt white.

Last winter I failed to put the boatcovers on (Another story for another day!).

As a result rain did penetrate the roof and the inside matt white has all peeled off

What should I do with the inside of the blister now ?

I have in the last week taken the outside of the blister back to bare wood and intend to coat/s with Le Tonkinois as I have before.

All guidance will be gratefully received.

I am surprised that damp would go through that hot-moulded Agba if properly coated. Is the LeTonk sufficiently waterproof for the job is one question, or did you apply enough coats?
Anyway, in your situation I would be inclined to use a "breathable" paint finish on the inside so that moisture comes through rather than pushing the paint film off. Something like this maybe: Solignum Architectural (Solvent Based)
I believe people have sheathed the blister and deck of Atalantas with epoxy/ woven glass, which if carefully done and coated in UV resisting polyurethane varnish looks good. Is there still and owners association to ask?

 

[STATUE]

Thanks Rum Run, good sage advise.

I think you're right, the Agba and Le Tonk is indeed sufficient to keep spray and rain water out. I gave a false steer there.

So it's condensation and will try your suggestion for an alternative product.

 

[Rum Run]

Thanks Rum Run, good sage advise.

I think you're right, the Agba and Le Tonk is indeed sufficient to keep spray and rain water out. I gave a false steer there.

So it's condensation and will try your suggestion for an alternative product.

If it is condensation you might want to look at the cabin ventilation over winter. My draughty boat only gets it when I am aboard and breathing and is otherwise always dry.