Coolant overflow tank on 1999 F53 V10

I have a 1999 Ford F53 V10 under a 1998 Winnebago Itasca. Late Friday in Circle, North Dakota (in the middle of nowhere) my coolant over flow reserve tank sprang a leak. A local mechanic tried to seal the tank with epoxy but after leaving there the epoxy didn’t hold. I’ve ordered a new tank from Amazon.com for home delivery but for now I’m planning to try some “Eternabond” (I have with me) and hope it will hold until I get back to Indiana. The “Eternabond” says it’s good up to 200 degrees and I think the tank may get hotter than that. If it doesn’t hold does anyone have any another suggestion?

Dave