How do I maximize uniformity, wetting and/or flow of the coating?
Maximum uniformity of coating is achieved when a rod delivers the appropriate wetting speed. Because of surface tension, a rod with more narrow and rounded threads, whose open areas are closer together will deliver a faster wetting speed than one whose openings are farther apart. When dealing with low viscosity coatings with low solids, a variety of rod profile shapes will deliver a satisfactory wetting speed. When more viscous coatings are used, or coatings with higher solids content it becomes critical to select a rod profile that will deliver a fast enough wetting speed to achieve a uniform coat.
