I painted Dupont acrylic enamel, no hardener, no metallic, on a 1935 truck, dark green, and it came out perfect, no sanding, no buffing, just plain perfect. Just painted a 42 truck, same paint but light blue and cannot stop the orange peel. I tried different pressure, gun, thinner, nothing works. Now I need to color sand all. How long must I wait until I can color sand?