pikey get you home rad fixes.
Kseal
get plires and bend back and crush the leacking tube.
mix up a big dollop of body filler and really work it into the leacking area.
egg white is an old old trick that dose sort of work, i'll seal weeps and small holes splits in low pressue systems, but if K seal won't fix it egg white has no chance.
btw radweld is crap and rarely works