We have made some process improvements over the last year but are still plagued with paint peeling from the kick panels. We have in the past seen a silicone contamination issue and it did cause some fish-eye problems in our aluminum painting process, but nothing that affected adhesion. Do you have any suggestions as to what the cause might be? Anything new to the industry that we should investigate? We are looking for longer-term adhesion.
The logical approach would be to slow down the solvent balance a bit to assure flow, but with airless you have to be careful not to sag. Do you think that this is a plausible explanation for the blisters?
One customer wants to use a zinc-rich primer and TGIC-free top coat. After applying both the coats the painted test panels are failing mechanical properties. How can we resolve this issue?
What I don’t know is if holes, penetrations completely through the material, are also a problem? Should I be concerned for lack of DFT (dry film thickness) on the surfaces inside the holes due to FCE or since these are “holes” and not recesses, would I be OK pursuing this coating process?
I have a 750–1000 gal galvanized holding tank used for maple syrup production. I would like to remove the rust and coat the inside of the tank. Because of the use and need for it to be food safe I am unsure of what to use to coat/paint it. Any ideas?
Also, if you have another recommended paint application method besides electrostatic, I’d be willing to entertain that too.
I wanted to comment on the question about painting of plastic parts that a reader submitted to you. Here are some huge points to look at when you have these issues.
We are working with flame pretreatment but are seeing inconsistencies. Adding to our confusion is the apparent lack of consistency from dyne solutions—we see wetting out of the dyne solutions from 35–70, but then the coating, which is a 38 dyne, doesn’t stick consistently.
