Boron nitride coatings should be applied on clean surfaces. Grit blasting may be necessary. Types of application include brushing, dipping and spraying. While brushing can be done with the coating as received, dilution of the coating with the particular carrier liquid may be necessary for spraying and dipping. Spraying of water-based boron nitride coatings on metals may be improved by heating the component to 100 … 300°C. Only a thin layer (50 … 1 00 um) should be applied at a time in order to prevent cracking and peeling of the coating during subsequent drying.