Leak in Windscreen washer

Ok you bush mechanics it's not as critical as a radiator, but it is very annoying: leak at base of windscreen washer resevoir. Tried repairing with Araldite but this left a microscopic hole which is enough to allow contents to drip out over a day or so. I was wondering if the was a rubberised compound I could pour in and swish around the base, or something like Superglue that would run into the minute cracks? The pump and 'low level' warning switch attach through rubber gaskets and are easily removed. Any one had any success with similar problem and know of a good product?