Funk
pfm Member
I did this on the kitchen sink at our office as it was slow to drain (I suspect people emptying dregs from bowls of this, that or the other into the sink rather than into the bin first). I was successful in preventing water coming out of the overflow, unfortunately all it did was find its away out somewhere in the cupboard under the sink - a fact I only realised when a pool of water appeared from under the base of the unit next to the dishwasher...Yep. I always put a few layers of duct tape over the overflow otherwise it just sprays water everywhere.