Both offer durability varied color options and protection against elements.
Marine spar varnish hardwood deck.
However when applying a finish to your interior hardwood floor polyurethane is the better option.
Helmsman spar urethane is not recommended for large exterior surfaces where maintenance would be difficult such as decks and siding.
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Traditional varnish sometimes called spar varnish or marine varnish is a resin in an oil base with solvents.
It is semi thick tends to flow off brushes nicely imparts a warm amber color to surfaces and is easy to re apply over old varnish providing that the old varnish is not too badly degraded.
A spar varnish is specifically intended to protect the wood from being chalked or cracked off easily due to various weather conditions extreme ultraviolet exposure and other harsh elements.
Exterior finishes give protection for required maintenance due to moisture heat expansion contraction and ultraviolet light.
Overall polyurethane is generally used for indoor household projects like bookshelves and desks while varnish is popular for outdoor surfaces such as a deck.
The third coat was supposed to be semigloss but painter mixed the cans and about a third of porch had different gloss.
I have covered porch with a new kiln dried treated lumber floor.
Any wooden pieces that are utilized under a covered deck or used outdoors or exposed to marine environment must have marine varnish applied.
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It has natural uv protecting properties.
Spar marine varnish does this.
Spar varnishes contain uv blockers that help prolong the life of the coating and while this kind of finish requires more maintenance than a penetrating oil it will look.
I have an outdoor porch and shower stall that is finished in cedar.
Slight ambering may be experienced when helmsman spar urethane is applied over light colored stains or wood surfaces.
I have used a marine spar varnish on my mahogany front doors and they still look great although they get very minimal direct sunlight.
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There was originally a sealer applied but after 4 years it is flaking and pealing off.
The wood has been installed 5 months ago so a long time to get low moisture especially with kdat we applied a water based gray stain and two coats of helsman spar varnish.
On handrails and vertical surfaces i prefer to use a marine grade spar varnish with a matte finish such as pettit z spar captain s varnish or epifanes wood finish matte.