Hi;
A neighbor is “recycling” an old dining table for outdoor use. Despite my protests (re: joinery isn’t going to last, etc, we live in Toronto Canada) she wants to give it a try. Its a birch table, currently painted with alkyd paint. She would like to keep the original finish but top coat the paint to give some durability. I use a lot of marine (spar) varnish for kayaks and canoes that I build, so I plan to make up a test board with the alkyd paint, topcoating with this varnish.
Before I do this favor, I wanted to know if anybody had an idea as to the feasibility or longevity of this type of top coating?
Rob
Replies
Paint is going to be a considerably more durable top coat than any clear coat you could apply over it. Light colors are generally better since the principle enemy of exterior finishes is UV light. The paint should be sound. If there are scrapes or dings that don't affect the basic soundness, a fresh coat or two of paint would be helpful. I'd use a top of the line enamel--marine enamel would certainly be a good choice.. Be sure to coat all surfaces, and for ground contact surfaces I would impregnate with epoxy letting leg bottoms absorb as much as they will.
(The problem with clear coats is that they are clear, which means that UV light penetrates throughout the thickness of the film, gradually breaking down the finish. Pigment blocks light, and, depending on the color reflects more light both reducing degradation and confining it to the surface.
Thanks Steve
Kinda thought that would be the answer. She wanted that (and I paraphrase) "thick, white lacquer look that is all the rage". Its a recycle job and though environmently positive, given that I doubt the table will last more than 3-4 seasons in good condition, I'll go with the recommended white enamel paint. I'll plan to spray it on to get the smoothest finish possible and I'll buff it out to give it high gloss.
Thanks for the note on the leg bottoms. I already did the epoxy dips at the leg (bottoms and tops, as well as the apron ends where the removable legs meet the top. Anywhere water could collect easily and not drain quickly.
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