RFP wrote:

My boat was built with windows sealed on the outside of the hull.
They leaked adequately to cause enough damage that I could afford the
boat. I did replace them with acrylic and the installation leaked
after a few months. Next we tried nylon washers between the window
and the hull to maintain a minimum sealant thickness of about 3 mm to
absorb differential expansion and hull flex. This has worked well for
4 years.

Noted. I was considering using machine screws through both the acrylic and
cabn side, with lock nuts on the inside so that the fixings can be tightened
enough to bring the layers of material together without compressing the
sealing material.


--
Wally
www.artbywally.com
www.wally.myby.co.uk/music