Wrong Color of Powder
Is it true that one cannot change the color of an existing batch of dry powder coating material?
Q. Our condo manager has consulted with a powder coating material supplier for a paint process for replacement balcony railings on the ocean. After a 1,000-hour salt chamber test and other performance testing, he ended up ordering the incorrect color of powder coat.
- Is it true that one cannot change the color of an existing batch of dry powder coating material?
- The manager wants to get the correct color by applying a liquid polyurethane paint or an enamel paint on top the powder-coated surface. My gut tells me that is not a good idea, and it would not last and might flake off. Am I correct?
- If the above two options are not viable, what options are available? R.L.
A. It is true that you cannot change the color of the dry powder. Powder is melt-mixed to blend the dry ingredients, and it cannot be changed by adding dry ingredients.
If the powder is already applied but the railing not yet installed, you can scuff sand the surface and apply a second coat of the correct powder color over the incorrect color. If the rail has been installed already, you can apply a polyurethane liquid paint over it if you prepare the powder surface by roughening it with sand paper. A lot of labor there, but it will work. I would sand and then prime, then apply the polyurethane.
Question: What methods are available for removing cured powder coatings, and what are the pros and cons of these methods?
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
What is right for the customer?