Slime tire liners have a bad rep...people have reported in the past that they dry out fast and crack apart 'causing flats'. Mr Tuffys and Stop Flats 2 are more popular choices. Not many use Panaracer liners and it's more geared towards 700C tires (
30mm width), but it seems to me to be a better solution since it has an adhesive side to keep it in place.