Outdoor wood picnic tables/benches - how to refinish?

outdoor benches tables image

Lepke

We have some outdoor wood picnic tables that are currently unfinished and kind of grayish from being outside for years. I would like to sand them then apply a clear polyurethane finish on them. Is that what I would use? Is there a special kind that I need? I've never done this before so any help would be great! By the way, I don't know if this matters, but the tables are in the sun pretty much all day. Thanks for your help.
If I just sand it instead of powerwashing it, will it also work?

Answer
You could clean them with a high pressure sprayer and then after it dries apply a couple of coats of spar varnish on them, that is what they use on boats and would hold up the best.

Can I varnish over old varnish on outdoor bench without stripping it?

Miriem

The picnic table set was left outside too long in bad weather. The top needs sanding before restaining and varnishing, but the benches are in pretty good shape. Can I just revarnish over the old varnish?

Answer
Yes but I suggest you give it a light sanding first, then wipe it down with white spirit before you apply fresh varnish.

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Title Post: Outdoor wood picnic tables/benches - how to refinish?
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