Would not know but answer this. Is the leak where you can put a finger on it?
IF not. Disregard this post
IF so: Seal All.. this is, near as I can tell, very close to if not identical to 1950's DUCO ariplane glue (The stuff they loved to sniff) Follow directions for fixing an ACTIVE lead on a gas tank, it works, then do a proper repair after you have run it down to empty.
It also works on tents in the rain.. Just make sure only the chemical touches the fabric.