Reduced gloss, less transparency and imperfections that can even destroy the protective properties: these and other problems can be caused by foam in water-borne paints and coatings. Foam has many causes, among them mechanical introduction of air during mixing and application, displacement of air on surfaces during dispersing, and over-rapid drying (blistering) of a paint. But no matter what the precise underlying details are, it's always unwelcome. Careful mixing and slow drying can suppress it, but that still leaves too much room for human error, especially as the processing time would be unnecessarily long. Fortunately, relief is available in the ...