If I may, here's a technique that I am going to be using to repaint my HL Tiger. It's called 'shadowcasting' I've used it on 35th scale kits before to good effect.

Start by giving the entire tank a coat of Tamiya Panzer grey. I've loved Tamiya paint since it came out in the early 80s... way less toxic than Humbrol or Floquil, and srpays like a dream. I thin mine half and half with 100% rubbing alcohol.

Once you've let it dry for 48 HOURS (let that paint cure!) load your airbrush up with black paint, and set the spray to a fin3 1/18 inch spray. Then, spray thin black lines of paint along panel lines, recesses, and any edges where horizontal and vertical surfaces meet.

Then, let it dry.

Then, load your brush up with more Panzer Gray, and mist it onto the vechicle, so that you almost completely cover the black. Just enough black will show through to add depth to the paint job.

Then, give the tank a light black wash, and drybrush with a little steel to pick out the raised detail.

It's killer!

Shep