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Sealer under spar

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Forum topic by Insagent posted 302 days ago 369 views 0 times favorited 4 replies Add to Favorites Watch
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Insagent

50 posts in 908 days


302 days ago

Can I use a sander sealer under spar varnish? It’s on a walnut outdoor bench. Thanks


4 replies so far

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tefinn

1199 posts in 1034 days


#1 posted 302 days ago

You can, but why? There is no reason to use sealer under spar varnish.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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Insagent

50 posts in 908 days


#2 posted 302 days ago

I was thinking it would pull the grain out more. Will it not?

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tefinn

1199 posts in 1034 days


#3 posted 302 days ago

If you’re using a spar varnish that’s oil based, the varnish will bring out the grain on it’s own. Hence, no need for the extra step of the shellac. The varnish will also bind to the wood better without the shellac. Using the shellac under the varnish outdoors may cause the varnish to need refinishing sooner.

Edit: Try to stay away from the urethanes like Helmsman. Also the marine varnishes will last longer.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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pintodeluxe

3264 posts in 1410 days


#4 posted 302 days ago

1+ most finishes work as their own sanding sealer. I try not to mix finishes if possible.
They say shellac is universal, and is compatible with any finish. However, the only finishing problems I have had were with shellac as a base coat. The finish can crinkle if the air temperature is too hot, or exposed to direct sunlight.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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