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Forum topic by Joe966 posted 10-30-2016 04:10 AM 327 views 0 times favorited 1 reply Add to Favorites Watch
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Joe966

3 posts in 410 days


10-30-2016 04:10 AM

Topic tags/keywords: question finish outdoor furniture

Hello, I am new to this site. I am sure that there may already be a post regarding this but I couldn’t locate it.

I am building some outdoor furniture and to the point of doing a finish. I have a good deck stain that has polyurethane in it already. If I use this, do I need to use a secondary top coat such as Spar Varnish?


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JBrow

1273 posts in 754 days


#1 posted 11-07-2016 02:22 PM

Joe966,

I am not all that knowledgeable about finishes but I will share what I think I know. Since the product you intend to use is labeled deck stain, I presume it is labeled for outdoor use. As a result I would think the manufacturer included some UV inhibitors. If true, the product labeling should indicate that wood surfaces are protected from sunlight and a top coat of spar urethane would not be necessary. On the other hand if the deck stain indeed contains a stain, applying multiple coats of the deck stain for some additional protection could color the wood more than you like. In that case applying a clear top coat or two for additional protection would be appropriate. I also think that if all surfaces, including those not normally seen, are finished, the project and the finish will hold up better.

If the deck stain and the spar urethane are both oil based, adding a top coat of spar urethane should work ok. But since I have never applied urethane over polyurethane I cannot say for sure.

Film finishes (polyurethane and urethane) exposed to direct sunlight will break down over time, even with UV inhibitors. As a result, seasonal re-coating may be needed. If the finish begins to crack and flack, it would have to be removed before a fresh coat of finish is applied. If the furniture is parked in a covered space, the furniture and finish would be protected from direct sunlight and water. In this case, the interval between refreshing the finish could be extended, but I find that table tops under an awning coated with spar urethane look better after a light sanding and a single coat of spar urethane. For me this is a spring time ritual.

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