I have read about a technique called washing to detail such things like a radiator on a motorcyle, it read as follows ;
’ For aluminium radiators and oil coolers, I wash the core with smoke black (mixed at a ratio of 1 part paint an 10 part thinners) so it settles into the recesses and it really adds depth to the final finish’
which should give this effect
My question is should the washing be done after the radiator has been painted in the aluminium if so would this not remove the aluminum paint ?
Your wash will be applied after your base coat. The wash medium should be neutral as not to affect your base finish. You can use a variety of techniques to acheive this. Do a forum search as this topic has been exhaustively touched upon, or go to Swannysmodels.com for step by step instructions.
Another option that is very popular is a “Sludge Wash.” Essentually, it is acrylic paint thinned with water and dish soap. This was a feature article in FSM, specifically; November 2001, page 42, by Paul Boyer tittled, “Quick and Easy Weathering.” I believe you can find on this site under Techniques: http://www.finescale.com/fsm/default.aspx?c=a&id=294
I use this technique all the time for my models and it works great. What I do is similar, only I use Van Gogh artist acrylics:
After the model’s color coats have been applied and are thoroughly cured, I airbrush a protective coat of Future all over the model.
I mix the color(s) I need for the shade of wash for the model
I add approx one eye-dropper full of water and mix it with the paint in an empty film canister.
I then add 1/2 half eye-dropper of dish soap and slowly stir the mix until well blended. *Note: Depending on how much dish soap you add, the consistancy will be thick or thin. I tend to mix mine on the thin side as a matter of preference.
With a soft paintbrush, I paint the wash over details, panel lines, landing gear, etc. The beauty of this technique is that, if you make a mistake, or don’t like the color, the wash can be safely and completely removed with a damp napkin or cloth and try again.
After the wash has been left to dry for approx. 15 min., I use dampened Q-tips and small folded napkin squares, I wipe off the excess wash from around the selected panels, recesses, etc.
When I’m satisfied with how things are looking, I finish by airbrushing a sealing coat of gloss or flat (depending on what your project calls for.)
Give it a shot, you’ll get a kick out of how easy it is! Good luck.