Beeswax is a natural preservative, making it an ideal material for artists who want to incorporate fragile or non-archival elements in their work. Absorbent papers, cloth, yarn|string and plant materials are all ideal components for a successful collage. Using encaustic medium with the these objects adheres them to your support.
Medium is a mix of pure filtered white beeswax and damar resin. Essentially, it's encaustic paint without pigment. Add it to encaustic paints to increase translucency for glazing, or as an economical sizing for panels. On its own, it can be used for effortless collage work.
This video from R&F demonstrates how simple it is to use encaustic medium to get more mileage from your paint!