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Boat House
Deck coating alternative to spar urethane
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<blockquote data-quote="Frank R" data-source="post: 356887" data-attributes="member: 14554"><p>Exterior grades of plywood are prone to checking due to the wood species used. The general rule of thumb is to use marine grades of wood or to cover the plywood with fiberglass cloth and epoxy resin.</p><p></p><p>Epoxy makes an excellent primer but it degrades with UV light. So it has to be covered with a UV resistant spar varnish.</p><p></p><p>Note that what is called "spar varnish" can be very different products. Do not use spar urethanes, the ones that are commonly available at the big box stores. You want a marine spar varnish, the old fashioned kind that uses tung oil. Man O War Marine Spar Varnish is an inexpensive one sold by the quart for around $33.</p></blockquote><p></p>
[QUOTE="Frank R, post: 356887, member: 14554"] Exterior grades of plywood are prone to checking due to the wood species used. The general rule of thumb is to use marine grades of wood or to cover the plywood with fiberglass cloth and epoxy resin. Epoxy makes an excellent primer but it degrades with UV light. So it has to be covered with a UV resistant spar varnish. Note that what is called "spar varnish" can be very different products. Do not use spar urethanes, the ones that are commonly available at the big box stores. You want a marine spar varnish, the old fashioned kind that uses tung oil. Man O War Marine Spar Varnish is an inexpensive one sold by the quart for around $33. [/QUOTE]
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Deck coating alternative to spar urethane
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