I have been intrigued by this conversation and thus inspired to have a go using the forge world method only simplifying it.
Firstly I do not own an airbrush or have the funds to do so. Luckily Tamiya clear blue and green is available in spray form and for the $11AU is a drop in the ocean compared to buying a decent airbrush.
Here is what I did:
1. Dry brush Leadbelcher
2. Dry brush Chainmail
3. Tamiya Clear Green (from the pot applied to only raised areas, it dries very quickly so thinning may be beneficial)
4. Tamiya Clear Blue spray ( two light coats allowing at least an hour between the two)
5. Asurmen Blue washed all over
Rubbish picture I know.... sorry
Needs some matt varnish but is obviously not finished.