I used fast etch on a few panels, the panels weren’t completely spotless. I just blew the dust off with a blow gun after stripping it with a media blaster. I then applied fast etch. I returned in a few weeks to find a streaky brown and white appearance on my panel. Is this rust? It looks like it might be but I’m unsure. Is it possible for this product to create rust if a panel is not fully cleaned?
Also I have a door that was stripped 2 years ago that had fast etch applied. In this case the panels were cleaned completely with metal wash. I noticed recently that there are random spots of surface rust upon it. How long does the rust protection last?