Moisture in cockpit and foredeck

I know nothing of your boat, but I suppose we are talking of cored construction - either with balsa wood or some PVC material inside, right?
If so, the former suggestion is certainly more radical and conclusive, but I can easily imagine that it's a helluva job.
The latter is certainly easier and less invasive, but depending on the core conditions, it could be very little effective, because the epoxy resin is likely to "trap" forever some wet areas inside the core.

If you have a decent access to the underside of these decks/floors, you could try the latter, but with a twist:
First, drill the multiple holes only on the bottom GRP layer of the sandwich.
Second, rather than inject epoxy right away, leave the holes open, and monitor the situation over time. You could see a bit of liquid dripping out from them, and if so, just leave the holes open and let them drip - the longer the better. Mind, it could take months if not years, but eventually you should see a decrease in moisture readings (particularly if your boat is in a warm and sunny climate). And only at that point, you could inject some epoxy resin in the holes and seal them all - though you might as well just forget them and leave them open.

There's a third alternative worth considering, which is doing nothing at all.
I mean, are all parts of the deck hardware firmly attached and sealed now? And is the cockpit deck solid, with no flexing areas?
If yes, I'd be tempted to follow the good old "if it ain't broke, don't fix it" rule...

Just to avoid possible misunderstanding, don't expect a lot of dripping from those holes.
Cored decks can't hold gallons of water, because there are no void spaces inside - well, there shouldn't be any, at least!
But some tiny amount of rain or washing water can find its way into the core, for whatever reason.
And if/when it does, it's likely to remain trapped, hence soaking the core material, over time.
So, by drilling several holes on the bottom GRP layer, you are unlikely to see a lot of liquid pouring out.
Maybe some drops, if that.
But the idea of having holes on the bottom and leave them open for some time is mostly meant to dry out the inner core.
In fact (and I forgot to mention this before), if the problem is in specific areas rather than widely spread, you could also leave some heater blowing warm air under the holed area, to speed up the drying process.
Good luck!

When you say the moisture meter found moisture.....
need to know to what extent.
My understanding id that a meter may give a moisture reading even if it may be only a void.
Sounds like one helluva void tho.

I had a trojan with spongy decks
I drilled a ton of 3/8 holes in the top of the deck.
I nearly ruined an air compressor by constantly pushing air into various hole and watching the water spouts all over the deck.
I kept dosing it all with Acetone to help displace the water.
This was a band-aid on a bullet wound repair.
I let that compressor run for days.... weeks but never really dried it out.
I epoxied the holes after a time.

If your deck is spongy then the only way to really repair it is to get the old balsa out and replace it.
Even drilling from below, which is a better idea than mine was, will not make the deck solid

I also have a 46.
My back deck had some soft spots from the fighting chair
I paid a guy to repair/replace all the bad balsa.
That was probably 20 years ago, still perfect

sent you a pm

P.S. nice boat

After removing teak cockpit deck found the main hatch was wet so it was opened up, dried out, and rebuilt. Pre purchase survey showed two wet areas on the front deck which they cut open and cleaned out today. Apparently they need to remove a section of headliner as the 4 bolts holding the port cleat are loose but just spin so suspect there's an aluminum backing plate with locking nuts. No idea how it got wet in there.

Wow ! , Spooky stuff to me. I think you have some one doing the work for you? Or are you doing it? Anyway keep us posted with more photos as it goes along if you can. Do they save the old cut out fiberglass sections and reuse them on the install ? Or is it all new glass? What do you install for the deck filler ? New wood or foam?

I have local company doing the work at my dock working stern to bow started with removal of the old teak on deck & gunnels, refinishing the fiberglass that was under it with new Awlgrip with combo of fine and course non skid added. No idea what filler they used in the hatch as that had been taken back to their shop but will see what they use on the front deck. I believe they will use the original glass all cleaned up in my yard.




Getting all the brown glue up was best with use of a heat gun but in some areas it also took up gelcoat creating more work.

Ten years of teak maintenance on the last boat convinced me no more exterior wood.

Ditto!

While removing the exterior teak, interior carpet replaced with teak & holly.
Weighted buckets of water while cement dried.

That looks great! That being said , I like wood and prefer the natural teak cockpit deck you had. I’m a little nutty, I enjoy the upkeep of wood.
But all of your work looks real good.

I would like to learn about paint spraying out doors at the slip.
I would think the paint will go all over the place and get the neighbors boat and what not?

I roll and tip everything I paint and varnish mostly because I don’t know any other way I’ve never done spraying before.

I have always admired well-maintained exterior teak and mahogany on boats. After working in a boatyard refinishing a lot of boat wood when younger, I decided it was more fun to fish than maintain wood.

I've seen 80 ft. plus, yachts being painted out on the main intracoastal waterway but never paid attention to the method. Several years ago I had my then 38' Bertram painted from rub rail up, while at my dock; all via spray but took the guy forever as the weather played into the job. More recently I had all of the dark green stripes on the 46 including the one at the top of the Tuna Tower repainted in gray with gold pin stripes while at my dock. The painter has a small Airless sprayer that eliminates nearly all overspray, and I think the rest dries in the air while still within short distance from the boat. My smaller boat's on a lift just a few feet away and no overspray. On the list still is hull paint from rub rail down Fighting Lady Yellow back to original white but painter said he wants to put her in a yard and tent after finished with the current at the dock projects.