My PVA glue won't flow from the bottle, should I replace it?

There is no need to replace the bottle, it is more than likely a build-up of dry glue inside the nozzle.

This is a common occurrence when the glue bottle is used regularly and the glue does not make it all the way back in to the applicator bottle at the end of use. This will continually build up until the flow is almost non existent or will not flow at all.

Just unscrew the top and look for a blockage. If you find a deposit of glue around the inside of the applicator nozzle, take an old pencil and poke around in the hardened glue until you feel it come free. Usually the glue will come out in a conical shape and feel like rubber.

Warm water can also help loosen the glue however you need to make sure it is not too hot otherwise you could damage the bottle.