A painter's tack rag or turpentine-dampened rag will help pick up much of this dirt. A careful cleaning is also necessary before a second or third coat of finish is applied. Most finishes will not stick to wax, oil and other materials which may contaminate the surface. Be certain that the finish is applied only to bare, clean wood. The temperature of the floor, room and finishing solution should be about 70 degrees F or somewhat warmer to assure that the finish flows on evenly and cures properly.
Most finishes cure faster in dry weather.
Therefore low humidity conditions are also ideal. A rough finish can also result if dust or small piece of dried finish are transferred from an old applicator or from a partially used can of finish. For each job, it is probably best to start with a new applicator and supply of finish. Provide adequate ventilation to carry off any fumes. Application of finishing materials should begin promptly after sanding so that there will be no time for changing moisture conditions to raise the wood grain.