Patent ID: 8124235

Claim:
A method of forming a matte coating for protecting a leading edge substrate against high speed liquid or solid particle erosion, the method comprising: premixing a concentrate of flatting agent dispersed in a solvent; adding an effective amount of a molecular sieve to said concentrate of flatting agent dispersed in solvent to reduce the moisture content of said concentrate; blending said concentrate of flatting agent dispersed in solvent into a polyurethane or polyurea composition of a polyisocyanate or an isocyanate-terminated prepolymer; adding to said polyurethane or polyurea composition a curing agent selected from a group consisting of an aldimine, a ketimine, a polyaspartic ester and mixtures thereof and an optional cocuring agent selected from the group consisting of a polyamine and a polyol and mixtures thereof to form a matte coating composition; depositing said matte coating composition on said leading edge substrate; and forming the matte coating on said leading edge substrate.