So I am only using a Brush I dont have a airbrush this is my first model ever and I am big space nerd and SLS is my favorite rocket so I wanted to build this model. So I was just curious whats the best way to go about painting the Core Stage. In IRL its a polyurethane foam to keep the tanks insulated for when the rocket is fuel up with Liquid Hydrogen and Liquid Oxygen. Thats why it has that very matte look. and also should i Paint the rocket with a white primer?