I' ve been using it for the pst 2 years. I have a suppresent suit for cold and the new sent lok savana for warm weather. I still use the carbon blast and sent away spray. I spray it on every layer I wear. I always wear a t-shirt some times white t-shirts (I wear mock tees for my camo shirt so the white doesn' t show) the carbon blast has stained my white shirts and socks but I' m not concerned about that. Here' s the trick, to avoid the blackness on your camo just spray the inside of the garmet. you should wash your camo inside out anyway. after I take my camo out of the wash (either hand wash or machine) while it is still wet and still inside-out spray it with the carbon blast or sent away and let it air dry. both porduct have to dry before they work. before I put my clothes on before I hun tI spray them again inside-out. by spraying the inside it does not show blackness on the outside. besides your sent will hit the inside of the clothes before it reaches the outside.