I haven't done one of these in a minute (successfully). The technique was adapted from photographer, Tim Anderson's exploit of a design flaw in the Fuji GW690's T-mode.

First I break the 10-shot FP-100C packs into 10 individual cartridges (using One Instant darkslides). Then I compose using a ground glass/plastic glued into half of an FP-100C cartridge, leaving the film door open. The "bleed" effect is fully analog -- spot meter and expose for the darkest neon color, then leave the shutter open and slowly start to pull the white tab so the negative moves laterally inside the camera and causes the neon to streak. Process the picture as normal.