depends what you are using the paint for. for terrain, i reckon your best option is textured masonry paint. you paint it on so it is a little slower than spray but it is tough as hell and won\'t melt any polystyrene. the spray stuff also tends to clog up in my experience but thats probably me. its great for terrain as you can texture, undercoat and protect in one go. if you cover all styrene bits with it, you can spray it normally too