I am an automotive paint formulator in the Middle East. Two weeks ago, our weather was rainy and we saw water spot defects on the horizontal surfaces of test specimens on our outdoor exposure racks. This was after the top coat curing step. We believed them to be fully cured.
We’ve studied this problem quite a bit but have not yet found a cause.
We currently use an aqueous cleaning system for our chrome plated parts before wet coat mask painting. The system is designed for exterior automotive adhesion specs. Can a modern vapor degreasing system provide the same adhesion?
Is there an industry standard for industrial equipment primer and paint Dry Film Thickness (DFT)? It seems like I have seen 3–5 mil thickness for both primer and paint for a total DFT of 6–10 mils.
I had a problem with adhesion on spun aluminum parts that were being coated with a clear acrylic gloss bake enamel. When we switched to an aluminum oxide sanding medium the problem disappeared.
We have a rather large plastic part. After painting it shows swirls that appear to be made by a brush. swirls are positive and can be felt using one’s finger. Can you make any suggestions as to what might be causing this problem? Could there be a residue from the wash left on the surface or something in the molding of the part?
I am a chemist for a paint supplier. I need to test a paint on steel panels and production parts and send them to an independent laboratory for testing. At what dry film thickness should the panels be sprayed for testing? Should the supplier paint the panels or should I have to? Do the panels need to be painted on both sides? Since we need to use an independent testing laboratory, can you recommend one?
The problem we are having is around the orifices where there are a double set of welds. Our material, which adheres to most ferrous and nonferrous metals, is adhering to the vertical surfaces of the orifices with no problem. Shortly after application, however, it will flow off the welds, forming an area of foam around the bottom of the weld. We not sure why this is happening or what to do to correct it.
I want to replace the mild steel smoke stack on the steam boiler with one made from stainless steel. The new smokestack material is 3 mm thick. What treatment do you recommend I apply to keep the paint from peeling off?
