Polyurethane Finish

Polyurethane is the standard finish used on most modern hardwood floors. It cures to a hard, plastic-like surface that resists moisture, scratches, and daily foot traffic. It is available in both water-based and oil-modified (solvent-based) formulas, each with different characteristics.

Water-based polyurethane dries faster (2–4 hours between coats), has significantly lower odor and VOC content, and stays water-clear over time, preserving the natural color of the wood. It is generally preferred for lighter wood species like maple and ash.

Oil-modified polyurethane takes longer to dry (8–12 hours between coats), has a stronger odor, and imparts an amber tint that deepens over time. This warm tone is often desirable on darker species like oak and walnut. Oil-modified finishes were historically considered more durable, but modern water-based formulas have largely closed that gap.

Both types of polyurethane can be applied over an existing finish coat as a recoat, provided the old finish is properly screened and cleaned for adhesion. Mixing finish types (applying water-based over oil-modified or vice versa) requires care and proper preparation to avoid adhesion issues.