Fine work with the spray job on that tank. Looks very nice and sharp.
I've got the Pledge Multi Surface Wax, or UK Future as I like to call it. I used it a couple of times and it does a good job, but I believe there are dissimilarities between this and the American brand.
Read this for everything you need to know :-
http://www.swannysmodels.com/TheCompleteFuture.html
I'm not sure if it mentions the water
olish ratios, but I think it was 4 parts water to 1 part polish. If you want it more glossy, then use less water. I don't think you need to use water at all, but wouldn't recommend as it may discolour. This stuff isn't clear like the American brand.
Anway, I don't think I'll use it anymore. I used clear coats on my Maquis Raider build and was very happy with the result.
Use Windolene to clean it out of your airbrush. It contains ammonia which is great for cleaning acrylic paint also.
If you like, you can buy an ultrasonic cleaner for your airbrush.