Finish does two jobs: it makes wood look the way you want, and it slows the rate at which the wood exchanges moisture with the air. In Southwest Florida the second job is not optional.
Film finishes versus penetrating finishes
A film finish – polyurethane, lacquer, conversion varnish – sits on the surface as a continuous layer. It offers the best moisture resistance and the best protection against spills. When it fails, it fails visibly: chips, scratches through to bare wood, and cloudy patches. Repair usually means sanding back an area or the whole surface.
A penetrating finish – traditional oils, hardwax oils – soaks into the fibers rather than building a skin. It looks and feels more like bare wood, and it repairs beautifully: clean the spot, apply more finish, blend. Its moisture resistance is genuinely lower, and it needs periodic reapplication.
Where we use each
- Kitchen cabinets: a catalyzed film finish. Kitchens see water, grease and cleaning products daily, and the durability is worth the harder repair.
- Bathroom vanities: film finish, and we seal the underside and back too. The unfinished bottom edge of a vanity is where swelling starts.
- Dining tables and desks: hardwax oil is our usual recommendation. These surfaces collect scratches no matter what, and being able to spot-repair rather than refinish is worth more than maximum hardness.
- Shelving and millwork: either works. Choose on appearance.
- Anything outdoors or on a lanai: a finish rated for exterior use, reapplied on schedule. There is no permanent outdoor finish, only a maintenance interval.
The mistake we see most
Finishing only what shows. A cabinet door finished on the front and left raw on the back absorbs moisture unevenly and cups toward the unfinished side. The back of a door, the underside of a table top and the inside of a drawer front all need finish, even though nobody will admire them.
Give it time
Most finishes are dry to the touch long before they are fully cured. Putting a heavy object or a rubber-footed appliance on a finish that feels dry but has not hardened leaves a permanent mark. Ask what the cure time is and respect it.
