Fillmore Valves

[Sea of vapours]

I assume that you are using the v1 Silca sealant? If I hadn't got loads of the v1 version left plus three large bottles of the Silca Replenisher, then I would have gone over the the v2 version which looks to be much more user friendly

I have a bottle of the V1 left, and some replenisher, too, which I'll continue to use on the tyres which have it in already. I - well, my partner - has a bike with the V2 in and it does quite readily go through a valve stem; easier than they suggest in their videos in fact.