Any of the three different grades of fine, medium or coarse are added directly to liquid paint to produce decorative effects or help obscure surface defects. On a microscopic scale, Coronado's Flattening Paste is adds a super fine texture to lacquer finishes that changes their sheen level. Depending on the amount added, you could vary from a gloss to satin or flat and anything in between. An additive to control insects or mildew growth is a special feature that works by dispersing a poison throughout the paint film. Because of their toxicity they are limited to exterior use only.
Insect control is desirable in covered carports and garages where spiders enjoy setting their webs.
Other insects that dwell on the faces of buildings will also be eliminated. Mildewcides work with great effect but any area that stays constantly damp, a dripping air conditioner unit for instance, will overcome its abilities to hold back organic growth. Additives can change the working properties of a coating or to add a special feature by simply stirring it into the product. Some are simple dispersants while others may react with the chemicals that constitute the paint film. Since all of these alter the formulation, manufacturer defect warranties may be compromised and care must be taken on the part of the consumer to ensure that the additive and the paint can be used together.