@Browndonneur It was sealant! Muc-off no puncture sealant, which is fine but not exactly the ultimate puncture fixing that it claims to be. @Hulsroy I just checked, it is the right way around but in your defence it looks wrong from the images, as the 'shoulders' have an angle to them.
That sealant is tenaciously sticky once it dries. I had to resort to a solvent after a great big glob of the stuff stuck to the back of a seat tube. My preference is the WTB stuff these days, though all of the pale milky ones are much of a muchness.
@Browndonneur It was sealant! Muc-off no puncture sealant, which is fine but not exactly the ultimate puncture fixing that it claims to be.
@Hulsroy I just checked, it is the right way around but in your defence it looks wrong from the images, as the 'shoulders' have an angle to them.