what is CFL cement specification ?
if its at the base of U cfl - use hot glue at the entries excepth the real ends (they get too hot for the hot glue). dont seal the gaps completely - the electronics need air
if its to mount the cfl i recommend to mount the socket or atleast use black zips or catch it with thin wire
glueing the cfl (other than at the base) may crack it due to thermal expansion