Starting to make a small airport for the test, he is not ready but i look nice!
About the tarmac grid? 1 cm x 1 cm in 1:500 scale, 2 cm x 2 cm in 1:400 scale (1 x 2 cm in 1:400 scale if you want to realize rectangles).Which dimensions of the concrete tiles do you recommend? There are many different sizes.
With which products would I do that?
Vice versa. You spray the hairspray once finished everything. At least 1 meter far otherwise the liquid drops of the spray will spread paint, colors etc ruining your work.So you spray the hairspray on the right spot and then paint over it with black, or the other way around?