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Marine ply is not worth the BS stamp on it unless you are ordering from somewhere like Robbens that spec the veneer material and are actually building a boat that will be used in saltwater.
If painting get WBP from a reputable supplier, if staining/varnishing then Birch.
Smith’s epoxy sealer will make it waterproof.
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Errrrr marine ply has nothing to do with the veneer.
Marine ply conforms to the same adhesive specs as WBP (using the same test in QC; a sample is submerged in boiling water for one hour, the sample cannot delaminate) the difference between marine ply and wbp is that marine ply cannot have any voids in the construction.
The standards above are accepted by the timber industry and are laid out in the following documents (if you fancy some bedtime reading): (BS) EN 13986, (BS) EN 636, (BS) EN 314, (BS) EN 635-3.
I’m looking to DIY a worktop for my utility room.
I need to span about 130cm above a washing machine and tumble dryer and the depth needs to run from 90-70cm to fill the space.
It needs to be relatively easily moveable, so was thinking of a French cleats against the left wall, timber bolted onto the rear wall for support, with the floating edge supported by kitchen island type legs.
What material would be recommended?
I was thinking marine ply and then sealing.
Alternatively an island size laminate worktop to chop down, though there would be quite a bit of wastage.