JB weld. That stuff works awesome and at $8 a tube it is a cheap, quick and permanent fix. I used it to seal a crack in a hot tub and it hasn't leaked a drop since.
2014 Jayco Whithawk 28DSBH
2012 F150 SCREW 5.0 XLT XTR Off Road package, 3.73 EL, tow package, Peragon retractable cover.