Seams are sealed and surface defects are repaired in a
polyurethane/geotextile composite applied over concrete, an earthen canal
or a ditch with a non-sagging polyurethane composition. This non-sagging
polyurethane composition is a reaction product of a polyisocyanate, a high
molecular weight polyhydroxyl compound, and a compound containing at least
two amino groups. A low molecular weight diol or triol, a catalyst and a
filler are optionally included in the polyurethane-forming reaction
mixture.
