Behind Anchor well fiber glass repair front section of 1/2 cab

[Portabletelly]

Long story short I just bought a second hand boat and when I took it out on its maiden voyage I noticed a bit of brown water came out the sub floor bung plug.

This led me on a mission of finding where the leak is coming from. I suspect the majority is coming in from the anchor well (that will be a separate repair) as well as water escaping from the top deck to the sub floor. I think waves splash over bow into anchor well drips through hits this board then goes down into sub floor.

The boat had all new trim in the cabin most likely to cover up the wood rott sitting directly behind the anchor well. Anyways I want to repair this issue as best I can to get at least another 5 years out of the boat. I was quite surprised when i removed the trim that this peace had no glass on the side facing the back of the boat and is only like a 5mm or 6mm ply. Is that normal?

I am thinking of cutting back the timber only on the inside of the yellow section. Then repairing the fiber glass hole. Then putting resin on the back of piece of marine ply and the exposed fiberglass and totally fiber glassing the entire new peace of timber on the side facing

the back of the back boat to sides 1 to and 3 in the picture. I am quite handy and have done many complex building projects, but this is my first time doing fiberglass repair. What I am after is some opinions on how more experienced people would do this repair if it was their boat, before I jump right in. Also what fiberglass materials would you use to make the bonds.

Attached is a few more pics for context. I think the timber on anchor well side may also have some wood rott so that will also need to be repaired. There was a small whole in the bottom of the anchor well to drain water (not a bung just a drilled hole) out however it was just a hole when inspecting the hole i could Cleary see two fiber glass layers (inside and outside and an air gap between) so the water would drain out of the anchor well past the first layer of glass and the water would work its way down between outside of the boat glass and well glass then work down into the sub floor. For now I have just used marine silicon on both outside of boat and anchor well to plug this 5 mm hole. I will put a proper drain hole. in when I do the anchor well repair.

Anyway, I would appreciate any feedback on how you would tackle this repair. Of if what I

have proposed has any serious flaws.

 

[Skip Johnson]

First order of business would be to verify the integrity of wood structure elsewhere in the boat ie stringers and transom. Not much sense in doing a cosmetic redo if the basic structure is compromised.

For the anchor well panel I'd cut and fit the plywood panel and then glass both sides before fitting it in place. The pictures don't show it but I assume that the forward portion of the panel is accessible so that you can bond the panel to the hull with some fillets.

Material wise glass for the ply panel could be 6 oz or more and you could reinforce the filleted area with a strip of biaxial cloth 4" or so wide. Not sure the biaxial is required but it's easy insurance.

 

[Blueknarr]

Welcome to the forum

My approach

Determine if plywood is rotten by poking with an icepick.

If soft cut out and replace with fully ( especially the edges) sealed plywood.
If sound put the interior back together and do everything from the anchor locker. Taping over the gap from the living side would help keep the repair from the anchor side contained.
I would NOT seal that piece or tab it to the interior space.

Use a 15-20 mm drill to enlarge just the interior half of the drain hole. Leaving the external layers intact. Remove all trace of sillycone.
Fill the enlarged hole with thickened resin
Use coarse sandpaper to remove any gelcoat and smooth around the filled hole and the gap going to the interior for at least 5 cm.
Cover the gap with 3mm of woven fiberglass and the drain with 1mm. Multiple layers of stacked fiberglass to achieve the 3mm
Redrill 5mm drain hole from the outside.
Sand and paint the repair to your desired degree of prettiness.

Tabbing anything to the interior is unnecessary.

Almost any brand of polyester or epoxy resin would be adequate for this repair.

Goodluck

 

[fallguy]

Fix that with some non-wood core. No reason to use wood if you are fixing it. It can be done with some 4 pound core and a piece of 1708. Form the piece and lay it up on a table and bond it in with some putty. Then tab it around or not, up to you.

 

[kapnD]

Need to see pics from the anchor locker side.