Whilst I has at Highcliffe School I had a chance to experiment with melted wax and tjantings to create batik samples. These were drawn with wax and then dyed with MX cold water dye in magenta. Although I used fine lawn, I think you may need to use more wax to get a better resist, and its certainly a method that needs some practise, although by its nature will never be perfect.
Getting the wax off was more of a challenge, these were initially ironed between a sandwich of brown paper, which seemed to melt and spread the wax and made the fabric stiffer. I then poured boiling water over them which removed more wax but killed the grass beneath! Once dried I was then left with a very thin layer of wax residue on the fabric, which I then ironed again in a brown paper sandwich, which removed most of it.
I quite like the method, but not sure sufficiently keen to invest in the tools required! I think I'm going to return to the shibori stitched resist method for comparison.