Here I tell you about how to spray paint an EPS wall panel. (EPS = extruded polystyrene, Diffusor = breaking, scattering a soundwave)
The starting point is a white – uncolored – wall panel, non-colored from production. As EPS doesn’t stand against any form of alcohols, a primer has to be applied. Otherwise, the spray propellant will eat away on the surface. The primer is water based, and propellant other than alcohol based.