The problem with glassed in plates is they are the perfect medium for crevice corrosion
. Any water
that gets in will be held there in a limited oxygen environment
. Guess what, that is what causes crevice corrosion
. Since they are glassed in, they cannot be removed and inspected. Most chainplates fail at the area that's in the deck
because of stagnant water
in a limited Oxygen environment
. When the plates are glassed in, the entire chain plate
from the deck
on down is in an oxygen deprived environment just waiting for a little salt water
to blossom into crevice corrosion. Since you can't get at your chain plates to inspect, you've no idea if they are in good condition or ready to break at the next gust of wind
. If your boat
is a leaky teaky, you're living on borrowed time with usury interest rates. They are notorious for crevice corrosion from low grade stainless hardware
. Add service
in the tropics and crevice corrosion is greatly accelerated.
The chain plates on my 43 year old boat
are out in the open with no sign of any water intrusion and were in remarkably good shape after all that time. A few did have some minor crevice corrosion in the deck interstice which I felt pretty good about. That is until I talked with a nationally recognized rigger, He said those small areas of pitting were just the visible corrosion and that the corrosion was probably spider webbing out in microscopic cracks that would cause the plate to fracture sooner than later.
Originally Posted by Sailing Partner
I have a 41' sailboat built in 1977 with four forward glassed in chain plates and has been in sailing service
the entire time without chain plate
mishap. Needless to say it has left the slip and returned safely numerous times. This factual experience overrides your ill advised opinion.