[DanEC]

Frank - I'm not sure what ERA uses but most contact cements should be applied to both surfaces and then allowed to tack off to where they are semi-dried before sticking the surfaces together. Sometimes if they are stuck together with the surfaces still wet they don't ahere. But once pulled apart they should still tack off and be able to be stuck back together. Personally, I use regular Contact Cement out of a can and apply with a brush. I have never had much luck with the spray applied adhesives.

Is the piece of vinyl full width across the top of the bulkhead? If so I guess you need to start in the middle and work to the sides.