Patent ID: 8906507

Claim:
A coating system comprising: a clear coat layer formed from a clear coat composition comprising: a crosslinkable carbamate-functional resin; an aminoplast comprising the reaction product of an aldehyde and a melamine; and a first adhesion promoter comprising an isocyanate hydrolysis retarder comprising a phosphate ester and an accelerator comprising a Lewis acid, wherein said first adhesion promoter is present in said clear coat composition in an amount of less than or equal to about 3% by weight based on the total weight of resin solids of said clear coat composition; a base coat layer having a thickness of 2 mils bonded to said clear coat layer and formed from a base coat composition comprising: a base coat resin; a second crosslinking agent; and a second adhesion promoter comprising a second isocyanate hydrolysis retarder and a second accelerator, wherein said second adhesion promoter may be the same as or different than said first adhesion promoter of said clear coat composition; a sealant bonded directly to said clear coat layer and free of a reactive primer disposed therebetween, said sealant formed from a sealant composition comprising an isocyanate component and an isocyanate-reactive component; wherein said second adhesion promoter is present in said base coat composition in an amount of at least 0.05% by weight based on a total weight of resin solids of said base coat composition to increase adhesion between said clear coat layer and said sealant.