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pij27 View Drop Down
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    Posted: 11 Mar 19 at 8:48am
I am looking to replace some plywood deck panels on a dayboat. Does anyone know of a good method of waterproofing or sealing these panels. They will be placed over the hull to give a level floor and if the bilge fills up with water then will be in contact with it.
Any help or suggestions please?
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JimC View Drop Down
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Not much is really waterproof for ever. Will they just get wet or will they stay wet? If they'll be normally dry then any good paint system will do the job.
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Posts: 44 		Post Options Post Options   Quote pij27 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 10:17am
This is decking planks around the centreplate, so underside will be in contact with bilge if boat left unattended for a while. otherwise just from spray or rain. Did wonder whether to use a wood hardener on the edges first and then a few coats of gloss paint? 
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Posts: 3398 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 11:34am
Is this the cockpit floor, Is weight an issue, if not what about fabricating floorboards from recycled plastic decking boards? https://www.kedel.co.uk/recycled-plastic-decking.html
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Posts: 44 		Post Options Post Options   Quote pij27 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 12:24pm
original planks only 10mm thick. use a movable small bar to hold in place.
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TBH, assuming its not a racing boat and you're concerned about budget I'd be inclined to use exterior grade ply, reasonable paint, and make up some templates so I can make new ones easily. Yes you could get into wrapping them in glass/epoxy and they'd cost 4 times as much and last 3 times as long. Sometimes you can overthink!
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Coat with epoxy resin.
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Posts: 44 		Post Options Post Options   Quote pij27 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 2:26pm
Thanks Jim, sounds like an easier plan. cut to size and a few coats of gloss?
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Posts: 3048 		Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 3:11pm
Originally posted by pij27

Thanks Jim, sounds like an easier plan. cut to size and a few coats of gloss?

Possibly some really thinned out varnish first too might help. Just to help seal the surface and the ends before you top coat. I did this on a boat I took back to wood. it really soaked in and where the paint has had a few knocks there is no sign of water ingress.
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Posts: 3398 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 4:14pm
Originally posted by pij27

original planks only 10mm thick. use a movable small bar to hold in place.

Thinest I found in plastic 20mm but there may be thinner out there, and they would last forever without any maintenance.
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