Just something that I've wondered about:
I add 60ml (.'. ~60g) of sealant to my tyres (Hans Dampf = 750g claimed). Total 810g
After a few months the sealant disappears. I top up with another 60g. What's the total weight of my tyre + sealant now?
Also: If the sealant has all dried up into that spiky ball thing, should I retrieve the ball before topping up the tyre? Does it act like a snowball, causing more of the fresh goo to stick to it?