Had this issue with Conti's that came with my bike. We got past it by mixing Tube sealant in with the normal sealant... With the tube sealant being much thicker, it sealed the side walls and stopped the weeping. Took a top up or three and 2-3 weeks to seal them completely but it works well...Also seemed to help for bigger punctures where the normal sealant didn't want to seal. Since switched to Onza Ibex front and rear, 6 months, no weeping... But they have the FRC sidewalls which are thicker and probably helps. Also, I personally don't use Stans, Personally find the batches are too inconsistent, one batch is basically just water and the next sludge... Joke is that the local suppliers water the stuff down to make more money...but who knows! Sticking with Tyre Juice, seals the wheels every time!
