The polyol b-1) in some embodiments is one or more polyethers. Such a polyether may be a homopolymer of an alkylene oxide such as ethylene oxide, 1,2- propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide and tetrahydrofiiran, or a copolymer of two or more alkylene oxides. If a copolymer, a polyether polyol b-1) may be a block and/or random copolymer as well as a capped copolymer. Homopolymers of propylene oxide, copolymers of propylene oxide with up to 20% by weight ethylene oxide, based on the weight of all alkylene oxides, and random and/or block copolymers of propylene oxide and butylene oxide are useful. Other useful polyols b-1) include polyester polyols, hydroxyl-terminated polyflmtadiene) polyols, polyacrylate polyols and the like, having hydroxyl functionalities and hydroxyl equivalent weights as described above. In some embodiments, at least 50%, at least 70% or at least 80% of the hydroxyl groups of the b-1) polyol are secondary hydroxyl groups. The b-2) polyols have a hydroxyl equivalent weight of up to 250. The b-2 polyol equivalent weight in some embodiments is up to 200, up to 150, or up to 130. At least 60% by weight of b-2) is at least one alkoxylated Mannich base has an average hydroxyl functionality of 2 to 7, preferably 3 to 5. The alkoxylated Mannich base may constitute at least 75%, at least 90%, at least 95% or at least 99% of the total weight of all b-2) polyols, and may be the sole b-2) polyol. The alkoxylated Mannich base is an alkoxylated reaction product of a phenol, formaldehyde and an alkanolamine. The alkanolamine may be, for example, a dialkanolamine such as diethanolamine, ethanolisopropanolamine, ethanol-2-hydroxybutylamine, diisopropanolamine, isopropanol-2- hydroxybutylamine, diisobutanolamine, isopropanol-2-hydroxyhexylamine, ethanol-2-hydroxyhexylamine and the like, an N-substituted monoalkanolamine such as N-methyl ethanolamine, N-ethyl ethanolamine, N-methyl isopropanolamine, N-ethyl isopropanolamine, N-methyl-2-hydroxybutylamine, N- phenylethanolamine, and the like, or a monoalkanolamine such as monethanolamine or monoisopropanol amine. The phenol is a compound having at least one hydroxyl group bonded directly to a ring carbon of an aromatic ring. The phenol may be phenol itself, a substituted phenol or a polyphenol that also may be substituted. A substituted phenol or polyphenol may be substituted with, for example, one or more hydrocarbyl groups having 1 to 18 carbon atoms. Any such hydrocarbyl group may be linear, branched and/or cyclic and may be saturated or unsaturated. Of