How can you improve the flow of dental inlay wax?

Heat: It sounds like you're thinking about work in a crown and bridge (dental) lab. When waxing a dental inlay, heat always helps the wax flow better. Be careful not to use too much or too little heat depending on the specific type of wax you are using and the stage of waxing.

Heat n lube: Thermoplastics respond to heat so change the storage temperature and use a surface active agent for wetting the inlay you are working with to improve the reach.

Change the company: If you don't like the working characteristics of your wax, the best solution is to try another company. Dr. Pecks purple inlay wax is very easy to work with. You also can run your wax under the hot water.