An Old Worn Out Boat, Prime Candidate for Cold Molding?

I wonder how your hull is doing?
I found after 10 years underwater Loctite Black PL roof and flashing by itself to be too soft and it will not be effective long term against water intrusion on flat planks, although likely ok in seams.
The better idea is Loctite PL premium polyurethane construction adhesive in all underwater seams, (it is like a semi hard closed cell foam sponge will compress and expand and keep seams sealed).
And in preference order for hull coating, 3m 5200, Durabak marine liner, Sanitred Permaflex, the 5200 likely the best coating for decades of protection.

And my other idea, I am going to use some heavy weight 1000 Denier Nylon fabric on parts of the hull, like the bow and keel, maybe wormshoe too, glued on with 5200.

Of course personal experience and opinions are nice to read, but nothing beats DIY to find out what works. Got to be willing to try different things and keep on learning new things. The Loctite Black roof and flashing does really well above waterline. One issue with it though is paints may dry and eventually crack if you just have a coating of Black PL. You might just use Durabak smooth as a sealer and coating, simpler and easier. Comes in various colors and then no need for paint at all.

 

That is a really unusual plan,it might work or it might fail dismally.Either way,please post the outcome here for the benefit of others.