Prepare 1 cup (2.4 dl) of very hot water. Make a thin mixture of 3
tablespoons (45 ml) of white flour and cold water. Pour the cold
mixture slowly into the hot water while stirring constantly. Bring
to a boil. When it thickens, allow to cool. Smear on like any other
glue. For slightly better strength, add 1 tablespoon (15 ml) of
sugar after the glue is thickened. After using a portion, reheat the
remaining in a covered jar or container to sterilize it for storage
or keep refrigerated. If wheat flour is not available, other flours
will work.