Increase Density Repair Damaged Lifeless Coats Add Lift to Double Coated Breeds Spectrum One Coarse & Rough Coat Substance Builder increases density and repairs damaged coats while providing texture & volume. Turn flat, lifeless hair into thick, springy, full coats for perfect styling and manageability. It is the only answer for precision scissor work and delivers unsurpassed visible results. Hard-coated Terrier jackets will lay flat with great texture and furnishings will be full and vibrant.