my taps never leaked. they just werent sealing quite as snappy as i'd have liked, meaning you got a bit more drip post shutoff than a forward sealing tap should.
2 way fix :
1: Lube as described above.
2: Once the pour is done, close the tap, then wind down the flow control to minimum, then engage the tap again. You will get a small trickle, then it stops. Return tap to off, and no more drips.