I have that slime pump and have used it. The difference is that it could take 10 minutes or so to get a tire full. The 4 co2 carts are about the size of a cigarette pack (a shade bigger) but will fill a tire in seconds. Nice option on the side of a highway in the rain.
BS
if the seal was broken during a repair.
go out and empty 4 into a completly flat tire. and ride it.
2 cartridges won't inflate my puny mountain bike tire, let along doubling that, and expecting it to fill a tire 6 times the size/volume.
giving information like this without doing it is BS.
you won't be able to ride a bike anywheres with 4 cartridges .
get a Campbell-Hausfield 12v pump from wall mart.
3 minutes total to fill a tire to 40 psi.