The inside of your cockpit will be a kind of medium grey, no? If so, use a darker grey or black, diluted with relevant thinner (90% thinner, 10% colour), mix, and slap onto the parts. Let dry. Then highlight with the drybrushing technique. HOWEVER, beware that the tinner could damage the base paint... That's why I use different type of paints for different 'layers'. Enamel base, artist's water colour wash, then light drybrushing with artist's oils. I know the oils are spirit based too, but I'm very gentle during the drybrushing (oils allow you to do that) and I've never had problems. If you do use water-based paints for your wash (be them acrylics or watercolours), add a drop of dish-washing liquid and a drop of vinegar to your mix too. That's all there is to it!