A composition comprising at least a part A and a part B is disclosed. The
part A comprises at least one polyol and the part B comprises at least
one isocyanate. At least one part further comprises at least one of the
following: a strength enhancer having a softening point of from about
120.degree. F. to about 400.degree. F.; a non-reactive hydrophobic
enhancer; and/or an impact absorption enhancer. These enhancers provide,
among optional other benefits, enhanced pull strength. Additionally, a
mass can be prepared by a method of combining part A with part B and
applying the mixture to a void. The compositions may also be used in the
repair of surface defects or for the reinforcement of structural members
such as spike holes left after spike removal from railroad ties during
road bed maintenance or repair.