I got a 60 wood bosat with all teak deck
after rain fall, look for black spots in the wood after is 'seems' to have dried, that's water
going into holes or soaking under bungs and travelling down screws into your boat.
it with salt
water, keeps the wood tight. don't scrub it with a stiff brush to make it look new, use a mop bit
of dishsoap and dash
of chlorox in a bucket (keeps algae and growth and bad smells out of it)
When you get fed up having it and trying to fix leaks
take a chisel and gut all the caulking, then fair with epoxy
and 406, put a skin of glass and paint
with non-skid! You'll wish you had done it long ago.
Short of my extreme fix, varnish
is a WASTE of time and money
, just a bit of soap will do.