MANY BACTERIA, FUNGI, AND ALGAE CAN CAUSE problems in the paint and coatings industry. These problems arise during manufacturing, in-can, and post application. To minimize or prevent the growth of these microorganisms, the appropriate microbicide (algicide, bactericide, and fungicide) must be effectively applied. Generally, the microbicides are divided into two general categories: Those used for in-can preservation and those used for dry-film preservation. Knowing the groups of organisms against which a microbicide will target is very important in selecting the best chemical to use. The organisms involved are discussed in more detail elsewhere in this manual.