I have a crack in the plastic radiator neck. I have a new radiator but cannot get it installed for a few weeks and my Jeep is losing more AF that I would like to see. I was thinking of draining down the radiator a little, sanding the crack (or split), cleaning the applying some JB Weld. If it will slow down the leak (its at the very top) and buy me 2-3 weeks I will be happy.