Wood Bed Finish

[britnjc]

I have just stained my wood for the bed and was wondering what kind of varnish people used to protect the wood from the elements: rain and sun. I know normal varnish will not stand up to the elements, I was thinking a marine grade used on boat to protect the wood and still give it a shiney look. Does anyone know of any vendors that would sell something like this? Thanks for the help as always