Sterling gloss coats are adversely affected by contamination from dirty spray equipment and oil or water droplets in the air line. Additionally, surface contamination in the form of silicone compounds, oily residues and waxes can produce a similar result. The minute contaminants become mixed with the atomized spray or are coated with it on the surface, they form small craters or fish eyes, ruining the film's appearance. Of course, when seen, the best cure for contamination is to clean the equipment, however the job may be too far along to practically do so. Adding up to one ounce U-3154 per quart of mixture may promote enough flow to eliminate the craters in the second gloss coat.