Allow 48 hours minimum to reach room temperature before using cans stored or received during cold weather. When applied in conditions of high ambient humidity, blushing (cloudy white film) may appear. Heating the coated assembly in an oven for 1/2 hour at 76°C eliminates this condition. Cleanliness of the substrate is extremely important to the successful application of a conformal coating. Surfaces should be free of moisture, dirt, wax, grease and all other contaminants. Otherwise, ionic or organic residues on the substrate could be trapped under the coating and cause problems with adhesion or electrical properties. The highest long term reliability for a coated printed circuit assembly will be when the conformal coating is applied over a clean, dry substrate.** Mask areas not requiring coating from overspray using suitable non-silicone masking methods or materials. Shake can vigorously before using and repeat frequently during use. Best results are obtained by spraying from a distance of 30 – 40cm in light even coats. A film thickness of 25 – 75 microns is sufficient to provide protection. To clean nozzle after use, hold can upside down, then press nozzle for a few seconds.