Color Matching a Refinished White Oak Floor to an Existing Red Oak Floor — Dunwoody, GA

How the color match was made in the finish, not the wood

Color can go into a wood floor in one of two places: into the wood itself, or into the finish that goes over it.

Stain goes into the wood. It penetrates open grain, so it can only be applied to bare wood before anything is sealed, and it colors whatever it lands on. That is what rules it out for matching two species. White oak and red oak absorb stain differently — the same stain applied to both comes out as two different colors. Used across species, stain tends to widen the gap rather than close it.

Putting the color in the finish is a different method, and it has a name in professional wood finishing: tinting. A measured amount of pigment is mixed into a coat of finish, and that coat carries the color in a thin film above the wood rather than inside it. Because the pigment never touches raw grain, it is not reacting with the wood, and it is not amplifying the difference between two species. It lays a controlled amount of color over the wood. Tinting is used to move a floor that is already close — warmer, cooler, redder — which is what was needed here after the sealer had set the lightness.

This is not stain mixed into polyurethane. Stain contains its own binder, usually an oil, which is a second resin introduced into a coating designed to cure as a single film. That is where the familiar failures come from: the mixture separates or thickens, pigment clumps and dries blotchy, the coat bonds poorly, and the finish ends up less durable than the same finish would have been on its own. A tinting colorant is built differently. MIXOL is a binder-free concentrate — pigment and carrier, no resin of its own — so it disperses through the finish without introducing a second resin into the curing film.

What makes tinting demanding is that the color arrives with the coat; NWFA’s sand-and-finish guidelines describe color carried in the finish itself as extremely difficult to apply. In a clear coat, an uneven pass shows up later as a slight difference in sheen. In a tinted coat, it shows up as a difference in color, and the floor has no tolerance for it: the coat has to be applied in one continuous application across the whole floor, with no stop in the middle and no lap where one pass meets the next. It also cannot be corrected afterwards. Abrading a tinted coat cuts into the pigmented film unevenly, and there is no way to put color back — so the color is never adjusted once the coat is applied. What follows a tinted coat is a clear coat. Where the floor is screened before that clear coat, it is for adhesion, not for color: LOBA’s data sheet requires an intermediate sanding once more than twenty-four hours have passed between coats, and recommends one before the final coat in any case. There is no touch-up on a tinted floor. There is the coat, or there is sanding the floor back to bare wood and starting again.

The amount of pigment is judgment. Too little and the floor stays where it was; too much and it reads as a color laid over the wood instead of the wood’s own. The rule is to move the floor as little as the match requires, then stop.

On this floor, MIXOL No. 10 Red was mixed into the second coat of LOBA 2K Duo — the third of the four coats — and rolled across the full 700 square feet in one continuous application. One tinted coat brought the white oak to where it needed to sit against the red oak. The floor was checked against the living area before the last coat went on, and a second tinted coat was not needed.

The fourth and final coat is clear. The tinted coat sits under a full coat of unpigmented 2K Duo, so the layer taking wear in a traffic lane has no color in it, and foot traffic wears into clear finish first.