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waterproof Plywood
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pij27 View Drop Down
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Joined: 27 Jul 10
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Posts: 44 		Post Options Post Options   Quote pij27 Quote  Post ReplyReply Direct Link To This Post Topic: waterproof Plywood
    Posted: 19 Mar 19 at 7:54am
Thanks for the advice, will look at the ply and if not right will change it, looks like seal it with epoxy and then use a decent yacht paint, maybe bilge/locker paint?
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snowleopard View Drop Down
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Posts: 66 		Post Options Post Options   Quote snowleopard Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 19 at 10:30am
The big problem with ply these days is it's hard to know what you're getting. Cheap ply with inferior glue, made in China, has flooded the market. It disintegrates in a year or two. It is often marketed as 'waterproof', 'exterior' or 'marine' but is all the same stuff and it doesn't match up to the old BS1088 standard.

Don't touch 'exterior' ply from builders' merchants. Go to a reputable supplier of marine ply such as Robbins and ask them to guarantee that it meets BS1088.

In order of quality/durability, varnishes are :

Epoxy
2-pack polyurethane
1-pack polyurethane
Genuine marine varnish
DIY store varnish.

The big joke these days is stuff bought in DIY retailers labelled 'Yacht Varnish' with small print saying 'not suitable for marine use'!
One hull good, two hulls better.
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pij27 View Drop Down
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Posts: 44 		Post Options Post Options   Quote pij27 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 19 at 8:55am
Thanks, will look into the sealant from Screwfix. Sounds like sensible thing to do first is to seal the edges and then either paint and varnish or epoxy then paint.
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davidyacht View Drop Down
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Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 19 at 9:55pm
Robbins Timber for marine ply.  On a previous boat I edge sealed with epoxy, then coated with Deks Olje which worked fine.
Happily living in the past
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ColPrice2002 View Drop Down
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Posts: 222 		Post Options Post Options   Quote ColPrice2002 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 19 at 7:47pm
A couple of coats of epoxy resin, couple of coats of good varnish, last coat sprinkled with granular sugar.
Allow to set/dry between coats, then wash the sugar off.
You'll have a non-slip coating, and it will last - it's worked on our Wanderer floor boards for many years.

Colin
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Riv View Drop Down
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Posts: 353 		Post Options Post Options   Quote Riv Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 19 at 5:11pm
Our club Wayfarer needed new bottom boards. It's on a drying mooring on a slope so the aft end of the boards are often wet and also when we don't pump it out. 

We brought 10mm ply from local builders merchant and coated it with 4 coats of this:
https://www.screwfix.com/p/no-nonsense-water-repellent-seal-clear-5ltr/57474

They had an extra coat each year and apart from looking rough there is no delamination.
Mistral Div II prototype board, Original Windsurfer, Hornet built'74.
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Sam.Spoons View Drop Down
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Posts: 3400 		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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jeffers View Drop Down
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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.
Paul
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pij27 View Drop Down
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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: 51 		Post Options Post Options   Quote Rusty69 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar 19 at 2:04pm
Coat with epoxy resin.
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