Marine Tex is another superior and extreme epoxy ,using a true 5 - 1 ratio mix , for boats , can take that temp there by a radiator easily .
Future consideration - Try what I do , I like too loosen a lower hose to drain , or in the case with my juke there is a "split" lower hose with a 3" plastic coupling under middle of radiator - I broke that loose to drain. EVER since radiators became plastic junk ?? I try to never use those weak , foolish drain-caulck valves.
Unless there is a real good reason , OR if I have got to one early-on( like first 4 or 5 years from new ) and it's not 'frozen' , AND I've coated with some very thick silicone grease when done to be easier the 3 years later I flush again
p.s. site doesn't like c***........drain-c***