Varnishing floorboards

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I am ready to apply a finish to the iroko floorboards of my 18ft mahogany boat. This will become a steam launch in due course. I know there is a case for leaving the boards bare, but with a steamboat there is all sorts of dirt, oil, coal etc, and I feel that a varnish finish would be nice, if only to seal the wood. The boat will only ever be used in inland waters, so I do not think that slipping will be a problem. It will be trailed, and indoors most of the time.I have used Epifanes on the rest of the boat, but it seems a little soft for floor use. Any suggestions? How about one of the varnishes specifically designed for floorboards, or an epoxy? Any help gratefully received.
 
Any varnish will scratch off with the hammering of steamboat use. I've a friend who has bare boards, which take on a grey dusty appearance after a while.
I would apply a coat of epoxy, sanded down, before applying a varnish finish. If you use a polyurathene varnish it will resist knocks, but when it does scrape off the epoxy will protect the wood underneath. Nothing will protect from hot coals unless you clad it in a metal near the firebox.
 
Just leave the wood bare. It does rain inland so slipping will be a problem. Wear will aslo be a problem. A light sanding at the beginning of every season will bring it back - oil if you wish but I wouldn't bother.
 
Whatever finish you use will have to be maintained so take the easy route - use proper marine varnish - it's the easiest to strip or sand and then recoat. Under no circumstances use polyurethane or one of the finishes which advertises that "it does what it says on the tin" - thats for building sites and painters and decorators. Coelan is even worse to maintain.
 
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