|Dedicated corset lovers will always sing the praises of steel bones--stronger! last longer! better support!--but purchasing and preparing steel bones gets expensive right quick. Rigaline and plastic boning is a more affordable alternative, but it is well known for warping under body heat, not lasting terribly long, and not offering enough support.
Double your sewable or plastic boning! Cut two pieces to fit in your boning channel. Trim the edges to a curve (to prevent accidental poke-through). If you would like, hold the two pieces of boning together and run the ends through a flame. With gloves on, pinch the ends together to melt the two pieces together. Slip it into your boning channel and go ahead on your way!
This technique is difficult to apply when using twill tape as your boning channels because the double thickness of boning is a very tight fit. It can be done, but it's a bit more difficult.