Do a thorough cleaning by removing dust, peeling parts, grease and other contaminants. On surfaces with presence of old paints, prime with a hand diluted with 40-50% of the product. On new surfaces prime with a hand diluted 50%. Then, apply a second coat diluted 5-10%.
The surface must be dry, since the presence of excessive humidity inside the surface, in the phase of solar radiation, can generate steam which causes the formation of bubbles and the subsequent detachment of the coating.