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The end grain at the bottom of legs wicks up water like a thirsty sponge, providing a perfect home for the fungi that cause wood to rot. Sealing the end grain with spar (or any other finish) often fails because the end grain is so porous. Exterior wood glue fills the pores and seals out water much better. Brush on one coat, let it soak in and dry, then put on a second coat for good measure. If you slop any glue onto the visible sides of the legs, wipe it off and resand the spot before finishing.
Even when wood legs are sealed (see tip above left), they shouldn’t stand directly on wet or damp surfaces. Plastic glides provide the perfect moisture buffer. A pack of four costs about $2 at home centers