we patch curtains all the time, works good. but if you got a end tore off that is going to be tougher, we also got curtain end the hogs got a hold of and ripped it off all the way from top to bottom. just 2 ft though, probably just going to fasten the repair to the barn, like a extended curtain pocket.             if there is at least a foot of material on the top to glue to, you'll be alright, if there is nothing left on top, probably should just remove the torn part from the curtain rod and cut a new piece to fit, with the curtain being longer than the hem by a foot, so you got a flap to glue to the original curtain.       also the cleaner the better.