Hardwood Floor Finish Applicators
Upon using any type of finishing brush or roller it becomes important to be aware exactly what type of 
finish is being applied. Following the finish manufacturers specifications will prevent any problems. In actuality some will dissolve applicators.
Applicator Bars (T Bars)
These tools are equipped with long handles (shown right) with sleeves that slip on and off during storage or cleaning purposes. Sizes can range from twelve to 24 inches with the latter generally used for larger projects such as commercial applications of gymnasiums. These tools have swivel type handles with accessibility for extensions.
T Bars are used primarily for water based finishes. They are also the most difficult type of applicator to use.
Lambswool Applicators
These tools can be natural or synthetic cloth encased around wooden blocks with long handles. Solvent based finishes (oil and other variations) are predominantly used with these tools.
Rollers
The rolling finish application has been recommended more in recent years from finish manufacturers for 
reasons the finish flattens more easily and it’s also easier to work with. They’re also far easier to fix spots you may have missed opposed to reaching with a heavier T Bar. The most common nap thickness professionals use is 3/8 inch in the candy stripe fashion. This style gives one a better idea of how the roller is performing when being used. In other words, rollers that get stuck or stop rotating tend to stray off course.
Brushes
Brushes for finishing can come in the form of foam, natural and china type bristle, with the latter being the most popular among pro finishers. Once again, for all products mentioned, always consult with the finish manufacturers specifications. What may appear to be a great product could result in expensive fixes.
Notes
If you’re dead set on a particular finish type always do a test run before applying to the floor itself. Exotic hardwoods in particular may be composed of chemical compounds or oils that slow drying time and can even change the color of the hardwood. Think about it when cutting an unusual hardwood. Does it smell strange or odd? It’s the inherent makeup causing the odor.
Some types of hardwoods may be oily in nature where some finishes work while others do not. Oils may leach creating finish bonding problems. In this case, sealing immediately after final sanding is recommended.
