Performance of Dry Film Preservatives Under Outdoor Conditions
There is currently a trend toward consolidation of dry film additives by some manufacturers. This trend should be approached with caution. Most of the preservatives on the market have a broad spectrum of activity and are toxic to microorganisms at low concentrations.
The behavior of the products in different formulations can vary dramatically. Intuitively, the solubility of the molecules in water and in the various organic materials in the formulation will affect rate of migration of the product out of the paint film and, therefore, affect the durability and efficacy of the product. Ideally, the migration will be fast enough to provide an effective dose of the product on the paint film surface, but slow enough to provide years of service.