Are you 100% sure it is your hull-to-deck joint that is leaking? The Ballad did not use the common hard adhesive putty to join the two, but rather a sticky butyl sealant (which no doubt you have encountered.
) If I may modify one of your photos...here is the hull/deck joint proper, with butyl sealant above the hull's turned-in flange:
Is the water coming in at that interface? Because our sealant is still very much doing its job. Our leaks come from the thru bolts, which compress into the toe rail over time and then drip. Do your carriage bolts have stress cracks around them on top of the toe rail? That may be the cause of the leaks. The corrosion down the length of the bolts suggests that.
Since we have removed the inner skins from the side decks and will need to tape them back on anyhow, we may clean off excess sealant and glass over the whole hull/deck joint anyway. If it is only the bolts that are leaking, those can be popped out (easy, tho tedious) and rebedded. You could use thickened resin under the head, or a flexible epoxy like G*Flex, or polysulfide, or polyurethane (3M 5200), or butyl tape.
Some thug went around our entire outside hull/deck joint with silicone caulk, which will need
days of scraping & chemical washing to get off.
It was the stupid bolts that were leaking, anyhow. Not the joint itself.
You can see the gel-coat mismatch in the right light. But the new gelcoat was sprayed too thick & has cracked, so we are getting leaks there. I'll need to grind it back and epoxy-fair it before we paint.
In Northern climates, renewing the foam or adding carpet like Peter has done would be helpful both in maintaining cabin temperature & holding down condensation.
