They make scissors for cutting spectra/kevlar fishing line. That is what I use, work fine. Look in the non-flyfishing section of your local sporting goods store, or online.

http://www.basspro.com/Rapala-Super-...duct/10203379/
http://www.cabelas.com/product/Super...h-All+Products

I would get a dedicated scissor for this, and not use the ones I use for other materials.