What Does Fat Edge Mean?
A fat edge is a visible coating defect that occurs due to an improper paint application on a metal surface intended to prevent corrosion. It is characterized by significant volume retention of the coating at a corner or edge of the metal substrate.
Corrosionpedia Explains Fat Edge
Fat edge is a problematic occurrence because it can delay metal equipment installation.
It typically occurs due to an inadequate chemical composition or mixing of paint components, a drying temperature that is too low, excessive solvent retention or a combination of these factors. In addition, the selected coating may not be suitable for dip application.
Using a more suitable coating for the given substrate metal and/or carefully evaluating the chemical composition of all paint components is the best approach to prevent fat edge. To repair fat edging, removal of the old coating and reapplication of the coating is required.