ALL organic coatings deteriorate and their performance characteristics are diminished with time. Surface condition 3. Method of application 4. Quality of material and formulation 5. Environmental conditions to which product is exposed 1.
Different metals corrode at different rates when exposed to the elements.
It is reasonable to assume that the more corrosion resistant the substrate material is the longer the outermost organic coating can be expected to last. For example powder coating aluminum lawn furniture will last longer than powder coating over steel lawn furniture. Likewise powder coating over zinc plated steel will last longer than powder coating over raw steel. The condition of the surface is a very important factor in the life expectancy of the finish. Mill scale, rust, oxidation, bad plating, welding slag, burnt on oil or grease, hard rinse water deposits, or any other surface contamination will have an adverse effect on the total life of the selected finish.