6 months is not that long. If the epoxy is somewhat cloudy, put the bottles in warm water for a while and then give them a good shake to mix up the chemicals. If the pumps are not working or are a little stiff, soak a rag in acetone and wrap the cloth around the tops of the pumps. Then cover the whole rag in a small zip lock bag or plastic and seal tightly with a twist tie or elastic band. Leave the rag on for a while and let the fumes do their work.