Spread-Em PVA Tape
This woven tape has a coarse texture to its flat cross section; this makes it perfect for stringers because the cross section will actually hold the baits apart even with the force of the cast.
It is not necessary to tie this onto the hook either, because of the woven make up all you have to do is hook the point of the hook through it, it will not tear on the cast and this ensures no residue is left around the hook once the tape has melted.
This material is very strong when dry making it ideal for tying up the top of solid PVA bags.