You can weld it back together with either one of the soldering iron attachments or a hot air gun
If CLEAN plastic is heated up to the glassy state it will weld together if two pieces are touched with light pressure
Note I said CLEAN
I have sucessfully welded dozens of tanks that are splitting at the seam
The cheap welding kits are about $ 60 ( AUS ) so that should be around $ 20 to $ 30 US .
The only catch is it must be the same type of plastic
Most chemical & oil drums are HDPE as is the frostly milk bottles ( clear ones are PET )
Ignore all the BS on face ache about using zip ties on everything or the same soldering iron tip you use for soldering, that will not work
HF should have some cheap Chinese kits and they will do what you want
Clean the surface using a STAINLESS STEEL ( and only stainless steel ) brush then clean with acetone .
V out the seam slightly.
If you have a heat gun, preheating till the region just starts to look glassy will make a better weld then apply the welding rods in the kit
Scrape the seam level & check it is sealed then I put a patch over the top using a lump of milk bottle .
Worthwhile to have a look for a discarded chemical drum and do a couple of trails first .
There is a very short temperature difference between glassy , slumps & melts and to be successful the latter two have to be avoided.
A clean & polished stainless steel ( not chromed steel ) putty knife or pallet knife is really good for smoothing out air bubbles .
Sounds difficult but it is very very easy to do once you get your eye in.
And as Star already mentioned, no goop in a tube will do the job regardless of what it says on the label .
Even worse, once you have polluted the surface with any goop in a tube, it can never be successfully welded .