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A mixture of hydroxy functional polymers which can be used to form isocyanate prepolymers which are non-hairing at application temperature are disclosed. Examples of suitable mixtures of hydroxy functional polymers that can be used to form the prepolymers are: (1) linear polyester blends, comprising a first and second polyester wherein each polyester is the reaction product of a polyol and a polyacid, wherein a + b < or = 4, c + d > or = 6 a + b > 4 or or = 10 a + b > 6 or or = 12 herein a is the number of methylene moieties in the polyol used to form the first polyester, b is the number of methylene moieties in the polyacid used to form the first polyester, c is the number of methylene moieties in the polyol used to form the second polyester of the blend, d is the number of methylene moieties in the polyacid used to form the second polyester of the blend; and (2) a blend of at least one non-linear polyester and one linear polyester, wherein the non-linear polyester is selected from the group consisting of polyneopentyl adipate, polypropylene adipate and polycyclohexanedimethyl adipate, and the linear polyester is selected from the group consisting of polyethylene adipate, polybutylene succinate, and polyhexamethylene sebacate, provided that when the linear polyester is polyhexamethylene sebacate, the non-linear polyester is polyneopentyl adipate or polypropylene adipate; and (3) a blend of poly epsilon -caprolactone and at least one linear polyester selected from the group consisting of polyethylene adipate, polyethylene succinate and polybutylene succinate. t