The extractives in exotic woods are known to cause drying delays, adhesion failures, and soft cure in the seal and finish coats.
Cold weather is upon us again, the following are some tips to help your finish perform to its maximum efficiency.
What are the most important factors contributing to proper drying of a finish?
Gym floor covers should never be used on a freshly finished floor until at least three weeks after the last coat of finish has been applied. For complete curing, the finish surface must be exposed to oxygen in the ambient air. Covering the floor during this process would deny the finish of oxygen needed to complete the reaction. This may result in a partially cured coating with poor physical properties.
Do not use pre-treated dust mops or floor cleaners that contain wax, paraffin, silicone, or mineral oil. Use of these products can cause adhesion problems when recoating the floor. Never use power scrubbers or automatic floor cleaning machines that disperse water on the floor…
Streaking is caused by the dragging and subsequent poor dispersion of the silica (flattening agent) in the polyurethane finish. These areas of varying concentrations of silica can cause areas of high and low gloss. Stop marks are a result of the silica being deposited on the floor after lifting an applicator. Lap lines occur when the finish does not properly flow and blend into a smooth film… An increasing number of contractors are successfully using rollers.
Polyballs are beads of paint or finish which protrude from cracks in floors when the moisture content (MC) of the wood rises, causing the cracks to close up. Paint polyballs are a bad problem, as they can be smeared over the rest of the floor, possibly requiring screening or even recoating.