Is pine OK for a
bathroom vanity?

Our vanities come in three finishes:

• —Stained: your choice of stain, with a polyurethane topcoat.
• —Painted: one paint color of your choice.
• —Raw wood: sanded and unfinished. Seal it before it goes into a bathroom.

On pine, a pre-stain conditioner evens out the stain, which is why our build guides call for one, and a test on an offcut first.

On a stained vanity we use an oil-based stain, then an oil- or water-based polyurethane topcoat. Water-based yellows less over the years, but it’s less durable than oil-based. We wipe the polyurethane on, 8–12 coats for the best finish, sanding between every coat, in a satin or semi-gloss sheen.

Why so many? Wiped coats are thin: finish makers’ data sheets give about a quarter of a mil for a wiped coat against one to two mils for a brushed one. Brushing builds the same protection in fewer coats; wiping goes on smoother.

Cure time depends on the finish. Most polyurethanes take light use after about a day, and some makers give weeks for a full cure: General Finishes gives 30 days for its oil-based topcoat and 21 days for its water-based one. So go easy on a newly finished vanity for its first month.

• —Use a water-resistant topcoat, and seal every face of the top: the underside and the edges as well as the surface.
• —When you drill the drain and faucet holes, seal the cut edges of each hole too, before the sink goes on.
• —Seal the cabinet as well: even left unstained, it needs its topcoat before it goes into a bathroom.
• —Staining it first? Use a pre-stain conditioner, and test the stain on an offcut.

Which finish: any interior oil- or water-based polyurethane. Finish makers call for about three brushed coats, or many more thin wiped ones, sanding lightly with 220 grit between coats.

Where it matters most: the drain and faucet holes. Their cut edges are end grain, which soaks up water fastest, and the USDA’s Wood Handbook notes that a finish only keeps moisture out where the end grain is sealed too. Give each hole several coats.

When the sink goes on: wait until the last coat has cured to the finish maker’s “normal use” time, typically about three days, then set the bowl and drain on a bead of silicone. Keep standing water off the top while the finish cures fully, over the next few weeks.

Spar or marine varnish? No need indoors. It’s made softer and more flexible, for outdoor wood that swells and shrinks in the weather, and it’s no more water-resistant than an interior polyurethane, which wears better.

Wipe up standing water, especially around a sink. Clean with a damp cloth and mild soap, and skip abrasive cleaners.

Recoating: we’ve never had to recoat ours. How often depends on how hard the vanity is used. The signs it’s time: the finish looks dull or worn in patches (usually in front of the sink), white marks show where moisture got into it, or bare wood shows through.

1. 01Clean the top with dish soap and water (mineral spirits takes off wax), and let it dry.
2. 02Scuff the old finish lightly with 220-grit sandpaper, and wipe off the dust.
3. 03Test the new topcoat on a hidden spot, such as inside a door, to make sure it sticks to the old one.
4. 04Wipe or brush on fresh coats, as many as it takes for an even sheen.

If the wood itself has turned gray or black, water has gotten into it, and it needs sanding back and refinishing, not just a recoat.

Our one-year limited warranty covers defects in our workmanship under normal indoor use, such as a finish we applied that peels, flakes or bubbles. It doesn’t cover water damage, whether from standing water, a leak or a raw piece that wasn’t sealed, or damage from very high or very low humidity.

Every standard size is pine. For red or white oak, maple or hickory, ask for a quote.

Oak, maple and hickory are heavier than pine, look more premium and cost more. They’re also much harder, so they dent less. By the Janka hardness test (the force to press a steel ball into the wood):

• —White or ponderosa pine: about 380–460 lbf
• —Red oak: 1,220 lbf
• —White oak: 1,350 lbf
• —Hard maple: 1,450 lbf
• —Hickory: 1,880 lbf

For a bathroom, white oak is the better oak: its pores are plugged, which is why it’s used for barrels and boats, while red oak’s open pores let water travel along the grain. And the common pines (white and ponderosa) move less than any of them as the humidity changes: their total shrinkage, green to dry, is about 8–10%, against about 14–17% for these hardwoods.