Looking good John! I thought you might leave the exhaust stains until after the salt fading or are you planning to avoid that area?
I'm going to avoid that area. I plan to do the salt fading on the upper surfaces only. I'm still not a master of this technique and only feel comfortable doing a light spray over a dark base.
On to the next step... salt fading. During lunch today, I thought I'd get a head start on the salt technique. I applied water on the upper surfaces and sprinkled on various grades of salt. Most of it is rock salt that I ground up myself, with a little table salt mixed in. This was done on top of a semi-gloss coat and I had a hard time keeping the water from pooling. That's all I could on my lunch break.
After work, the water had completely evaporated and the salt crystals were dry.
A thinned mix of gray is sprayed randomly over the upper surfaces. This is really hard to gauge as I cannot tell if I'm putting too much or too little gray. I err on the side of caution and decide to keep it light.
Removal of the salt is an intensive process as it has dried completely onto the model surface. I get as much of it off as I can using a stiff-bristled paint brush and then I resort to more drastic measures: I use a spray bottle of water and a clean microfiber cloth to remove the remainder. The result? Hmmm... interesting. Not quite what I expected. The pooling water must've collected the salt into clumps. Also the finer grained salt had no effect.
It's not bad but it's not great either. A flat coat will alter the appearance of this effect, usually by diminishing it so I'm hoping that it remains visible.
My current flat coat is Alclad Aqua Gloss plus Tamiya Flat Base. I have to be very careful with this mixture because too much Flat Base will result in a white frost effect. Also, when spraying a flat coat onto the model after the salt process, hidden salt crystals that were not removed will frost into a white stain. So I do the apply the flat coat in batches. When an area of salt frost materializes in a crevice or corner, I have to take a stiff brush or Micromesh to get rid of it and then re-coat the area with the flat.
With the flat coat, the bottom looks really good. I think this is the first time that I've liked how the bottom turned out more than the top!
So where's the salt fading effect? Oh, it's there but as feared, the flat coat really choked it out.
Other than that, the flat coat has really unified the different components of the finish: the camo paint, the masked markings and the decals.
The weathering on the top surfaces remains a question for now. Do I attempt a second salt fading layer? I know that the water will pool less on this flat coat so I may be able to get a more desirable effect. But... the disposition of the real Black 1 comes into play as well. Since the upper surfaces of this aircraft were repainted during the change from Yellow 1 to Black 1, the non-weathered look of the uppers compared to the well-weathered bottom could be argued as being appropriate.
I'll let this flat coat dry completely before I do anything else. Maybe I'll do some paint chipping next as I mull over that second salt fading pass. I'm leaning towards doing because the upper surfaces just look too clean to me.