I had a stubborn, or rather large, 2mm puncture which kept bursting at pressures above 100 psi. I had to load up with homebrew sealant made from thinned latex (100 yen shop sewing glue a few drops of ammonia water and water) containing rice flour, glitter dots and moons, and cut nylon string flakes, the latter packed in prior to the liquid sealant with a point-removed nail and some brake wire. To get the sealant in, I had to remove the valve core and extender and flip the valve out of the rim. It seems to hold 120psi now.
Stubborn puncture by
Timothy Takemoto, on Flickr
I will glue the valve area of the tyre back onto the rim, with 100 yen shop glue, next weekend.