Summer Solstice - Prep for Primer

I spent what I considered to be a large amount of time reading through the "primer wars" postings on Vansairforce.com.  After I reached the decision of deciding that I was going to prime, I went back and forth a number of times, completely convinced that I had my solution, only to read and research a bit more and find that I was changing my approach yet again.  It was a frustrating, yet enjoyable process of continual learning...probably a microcosm of building an entire aircraft for that matter.  As a matter of fact, I still may be in research mode and don't know it yet.  But I will soon.  Tomorrow I hope to spray the first test sample with my Harbor Freight HVLP gun and Deft primer...but I'm getting slightly ahead of myself.

The picture below illustrates the components of my selected surface preparation method, prior to priming.  PreKote is a non-toxic (chromate free) surface preparation (process) that the manufacturer claims replaces 4 chemicals and processes: 1. alkaline wash, 2. acid etch, 3. conversion coating and 4. solvent wipe.  The manufacturer emphasizes that the main purpose of PreKote is to promote adhesion of primer and finish coats (my interpretation), which will be the best deterrent to corrosion.

 I conducted my first PreKote-ing process tonight and will try to prime it tomorrow.  I applied the process to a corner of some .025 thick 6061-T6 sheet, by scrubbing the PreKote liquid with a maroon Scotchbrite in two separate applications.  The second application must be performed prior to the first one drying and by scrubbing in a direction perpendicular to the first one.  The pictures below attempt to contrast the treated area with that which was not. The sheet is standing on edge just a few moments after the PreKote process was finished by rinsing with tap water (no distilled or deionized water required).  You will notice the lack of water droplets on the PreKote side which hopefully indicates that it is sufficiently clean and ready to accept primer when completely dry.

 

 Hopefully the next post will detail the positive results of the primer test, which will mostly entail learning how to use my HVLP sprayer.  Also challenging for a paint nubie such as myself will be the entire process of mixing and loading the paint and actually applying a couple of light coats....stay tuned!