IMO, airbrushing a squiggle pattern randomly over a kit still looks too uniform, regardless of how ‘random’ you try to make it.
… And it takes too bloody long on a large kit such as a 1/32 Ju-88!
Enter the Scotch Brite masking technique which came about after I had been looking at pro airbrushing stencils online and thinking there must be a cheaper way.
Firstly some prep is required before using your Scotch Brite. Because these types of pads are dense, you must prepare them by tearing, pulling and reducing the thickness by tearing them in half carefully along their horizontal axis.
Here is an example of the Scotch Brite in action on Revell’s 1/32 Ju-88.
Airbrushing Tamiya XF-54 Neutral Grey through a Scotch Brite;
I completed the entire underside in approximately 40 minutes. The result;
I applied further mistings of neutral grey to reduce the contrast;
Where possible, I mix my own colours with Tamiya Acrylics mixed with 50% Tamiya Lacquer Thinner.
For RLM 65 I mixed up equal parts of XF-23 and XF-2 thinned as per above. In the airbrush cup I added this mix and then added the same amount of thinner to make it highly diluted. This allows the topcoat to be built up gradually. This makes it hard to overdo it and destroy the effect if you get heavy handed with the trigger.
The result so far;