I would follow Hersute's advice and only add that it is possible the glue is not fully dry. It's hard to give specific times for Ultra Hold (or any glue) to dry, as the thickness of the layer you apply will affect that time.

You're best off w/ more than one very thin layer of Ultra Hold. A good way to ensure the layer of UH is dry, is to lightly tap the spine of a comb into your glue layer. If ANY strings of glue are pulled up by the the comb, it is still too wet. Wait until nothing is lifted by the comb, then apply another VERY thin layer and repeat the test.

~FB