I have a Therabath that uses the special wax. It looks like a little bath tub where you place the wax in and it melts. Leave the Therabath turned on and the wax stays a warm, not hot temperature. You can dip your hands in the wax, wrap hands in Saran Wrap or Glad wrap, ( that holds in the warmth). You can do this as often as needed. When you finished, you can take the wrap off and the wax just peels off. You drop it back into the Therabath container and replace the lid til you are ready to use again. A rheumatologist recommended this for my arthritic hands. A great help. It limbers the fingers and the warm helps with the pain. I got mine at a store that sells health equipment several years ago. It's the best thing I have ever found to help my hands and doesn't require you to take meds so much.
You can do Google search and several sites come up. The Therabath runs in a price range from $170 and up, but I'm sure you can find them cheaper. My insurance paid for mine.
Here's a picture of some:
http://buybestprices2011.com/THERABA...IN-WAX-MACHINE
http://www.comfortchannel.com/prod.itml/icOid/1764