Hi ;
For most sprue cutting and parts separating jobs I now use a modified pair of light orchid covered cutters from H.L. . I found them in the beading department .They were cheaper than Xuron AND when they cut you get an absolutely flat surface on the part side . Weather it's P.E. Or plastic .
When I say modified them , I ground down the cutters from top to bottom making them thinner . I did it carefully watching the heat and got them so they actually can fit in between parts on an assembled model if needed . Or they can get between those pesky little spaces between parts and sprue on P.E. or again , Plastic .
I have an unmodified pair of the same ones for cutting medium to soft brass wire as well . T.B.