The basics Tarrago Color Stop Spray is a colorless spray that is used to fix the color on the inside of shoes.  The benefits It can be applied to all types of leather: smooth leather, suede, nubuck and also all textiles. The uses Helps to prevent transference of color from the leather to feet and socks. The bottom line It is especially recommended for leather boat shoes and unlined footwear where the leather is trough dyed.