The vibrant blue background emphasizes the silver detailing of the school of mackerel gliding across your wall in the Holy Mackerel piece. Limited use outdoors, safe on a lanai or covered space. Keep product under a covered area. No direct exposure to water or sunlight. For best results apply a premium wax, such as car or boat wax to the product. Apply prior to hanging outdoors and reapply every 6-12 months. Do not use waxes that contain cleaners (such as boat "cleaner/wax") as these will damage the surface.