I looked this topic up now, 5 years later, for an answer. I just wanted to let you (or more likely anyone googling now) know that I revived totally gross, solid wax resist. I would've just bought more but my local store is closed today and I had work to get done. I heated it up and added a little water, and started researching when it wasn't mixing well. It needs an emulsifying agent. I used a squirt of rubbing alcohol. I added it slowly until it was the right consistency and no longer clumping.