Scratches and Drops after ED Coating
What are some ways to fix drops and scratches after ED coating?
Q. We are using ED (high edge) on some visual panels for light commercial vehicles. Due to the nature of the process, we are having some unacceptable drops and scratches after coating. Are there any fix methods? If recoating is the only solution, then what should be the proper stripping method for these large, thin, cold-formed (pressed) panels in order to avoid deformation on forms? –H.D.
A. The most employed method to repair the scratches that go all the way to the substrate is to use a phosphate pen or pad over the bare substrate to provide basic phosphate treatment, followed by application of a wet paint of matched color and gloss with the electrocoat.
The wet paint can be applied in aerosol cans for ease with simple repairs, or as a 1K or 2K epoxy wet paint system for more sophisticated areas and higher corrosion requirements.
Light feathering or buffering with a soft pad after recoating could blend in completely with the scratch.
Characterizing the type of defect is essential in identifying the root cause and eliminating its source...
Choosing the right conveyor system, coating technology, and ancillary equipment.
This paper is a peer-reviewed and edited version of a presentation delivered at NASF SUR/FIN 2012 in Las Vegas, Nev., on June 13, 2012.