The purpose of research was obtaining fire retardant coatings based on perchlorovinyl resin with improved adhesive properties to protect fiberglass plastics. The article presents the results of studies on the influence of a modifier based on the phosphorus-boron-nitrogen-containing oligomer (PEDA) and filler, which is thermal expanded graphite on physical, mechanical and fire retardant properties of the coatings. It was found that the product PEDA is an effective fire retardant, and its introduction to the compositions provides fire resistance and high adhesion of the coatings. The dependence of the filler amount on fire retardant properties of the coatings, the ability to coking and coke strength were identified.