If you can only find the leak internally with a camera
on a stick, it seems it will be impossible to repair from the inside without some major disassembly.
I had the same problem on my boat ,in the 2 inch thick strip planking,caused by creatures called kupang in Malaysia
. They look like small snails, about 1/2 inch diameter with a single
crab like claw
that digs a hole in the hull to make a nest, from which they feed off the passing nutrients. When they dig in to the hull they don't ingest the wood and bottom paint
so it does not kill them. I developed four leaks
on my way to a ship yard in Thailand
from near Singapore
,and I used underwater epoxy on the inside together with a number of pre prepared patches for a temporary fix. The patches were six inch square 1/4 inch plywood
with roofing nails protruding through each corner. When a leak occurred,I buttered bitchumen on to the plywood
; then a covering of cheese cloth to stop the bitchumen from squeezing out; followed by another layer of bitchumen . I was then able to dive on the leak and attach the patch with only a snorkel.
My leak also started out as a small weep, but when I poked at it with my finger it became a finger sized hole with only the paint
on the inside of the hull to stop a torrent.
I also tried the quick fix cement trick, but I found that if there was too much water flow, or trying it on the outside of the hull under water,then the cement would wash away before it could set up.
What I did to repair the damage in Thailand
is a another saga.
Good luck and don't ignore the small stuff.
Sent from my iPad
using Cruisers Sailing Forum