Mal,
I haven't tried shearing elastic, although it is an intriguing idea. The Nylon thread is so easy to use that I haven't been motivated to try other methods. I built a 1/48 Tamiya Spitfire Mk 1 and used Nylon to replicate the aerials between the fuselage and the horizontal stabs. It looks great.
I clean my airbrush (Iwata Eclipse HP-CS) pretty thoroughly, so I haven't stored it in thinner, but it isn't a bad idea. I get kind of paranoid about disassembling my brush more than I have to, as the Iwata has such a fine needle and nozzle.
Lately I have been using the MM Acryl cleat coats for me sealer. I have also been using the MM metallizer Sealer under decals that tend to easily silver, it is great stuff! It hardens very quickly, and is super smooth. I have used future here and there, but haven't yet mastered it. I have mixed a batch up with a couple of additives so that it will flow through my airbrush better, so maybe that will work better.
As far as washes, I am still using primarily watercolors as they are easier and much much cheaper than good oils. I am not opposed to oils, I just still haven't quite gotten over the paranoia that comes from putting oils thinned with turpenoid on that paint job that you are so proud of... Do you know what I mean???
As to colors, I don't have any hard and fast rules, but it primarily depends on the subject being modeled, where it would have served, what the colors of the paint job, are, etc... I use a grimy dark grey for most of my washes, but I will also black, sienna, and umber quite a bit. Black usually looks too dark on tans, but not always, and I really like dark grey or black on most greys, blues, and whites. My Gustav was washed with the dark grimy Grey wash. The Academy M3 I am working on is painted with British Light stone (tannish yellow) so it will receive primarily burnt sienna / burnt umber washes. I may use the grey around the engine and on the wheels, I will just see what looks "right" to me.
I also get the effect with watercolors when "Wiping" although admittedly it is a little harder to achieve with water paints. My washes on aircraft are usually a mixture of sludge and free washes, depending on the location being washed and how rough the sheen of the paint. I like both techniques, although the sludge washes take more time to clean up.
Thanks for the help on the pics, I will use it.
Great talking to you!!!!
Scott