I have fitted new bath mixer taps and have replaced fibre washers. When i replaced washers i noticed i asnt replacing so much as adding as there were no washers in to replace. My problem is the cold tap pipe is leaking just a little over the join. It is a little drop oozing through about every couple of hours. If i wipe the join it takes several hours before anything appears. Is there any other way anyone can think to stop this?