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I've had nothing but a shit time with that stan's syringe. Screw it all the way onto the valve (with core removed), squirt the stuff in, unscrew it and loads of latex stuff just dribbles out as soon as you start unscrewing it. This is with valve at about 3 o'clock on the wheel. Think I'd be better off removing the screw on bit and squirting the fluid directly from syringe into valve.
Cheers, I ordered a 1L Caffe Latex from @cycleclinic last night and a Stan's syringe from the amazon.