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I'm not sure if such a product exists but if it did you'd want to put it on the outside of the membrane otherwise you have water pooling on the adhesive which would cause it to fail pretty quickly.
Most of the cheaper membranes break down and lose their water proofness eventually anyway (the claims of the more expensive ones are dubious as well) and are there to let damp air out rather than stop water getting in.
In your situation I'd make a note if where they are and if the roof starts to leak investigate those areas first.
Bobbo
Just discovered some small (10cm) rips in the roof membrane, we will have to replace it in the near future, but is there a tape to patch roof membrane that you would recommend? Not sure of what it is, apart from the fact that it is old, black and the weave is really visible. Is it worth getting an specialist product or shall I just go for black cloth tape? Just roof tiles and membrane atm, no isulation, no use for the loft yet apart from some boxes