A little tip, if you have silicon grease, put a little dab on the schraeder vavle before pumping up the vessel, when you pump the vessel the silicon lubes the rubber seal on the schraeder and stops it from leaking
Gonna do this later today, would WD40 (or similar) do the same thing or would that damage the rubber seal? Don't think I have silicone grease (I don't have silicone grease!)