I make a lot of concoctions at work.. for ease of application, dissolve the beeswax in a solvent.. maybe start with white spirit if you need something off the shelf.. but something which evapourates easily would be my preference.. make a bain-marie with boiling water from the kettle, stick your beeswax in a jam jar with the solvent.. start with 10-1 ratio (10 being the solvent) stir till dissolved (you might need to replace the boiling water if it cools).. the microwave would also work but that's where i cook my porridge.
Paint or spray the solution on the frame, the solvent evapourates (a fan can help speed it up) leaving a thin, even layer of beeswax.. i've got no idea how long this will last.. i know beeswax takes a lot of upkeep but i use this method a lot for applying thin layers of wax.. double coat if required...