[Pindie]

I just ended up on soapy water. Lasts longest and least messy. Slime works and can be done fairly cleanly but in the end seems overkill. Silicone spray eventually gets absorbed but the rubber (or disappears) and then cause leaks. Definitely check the lips on the red liner, if it has been nicked by a lever you can super glue any flap down or use a dab of quality silicone sealant to smooth over any surface blemish, obvs let it cure before fitting. Don’t forget that there’s 100psi pushing air out so damaged bits are usually obvious. Good point on valve cores. Keep them clean and swap if they leak.

stumo posted a link to some tyre soap. I think it needed to be anything but a paste one as a paste dries and then leaks.

 

[Pindie]

I tip whatever I’m putting in the tyre - slime/soapy water in before I fit the last side onto the rim. Just stand the wheel up. Pull bead away from rim. Pour in 200ml or so. Fit final final side. Do the 360 degree bounce on the tyre vertical thing and then pressurise everything. Not failed me so far. Easier than messing with the valve core and no chance of threads or granules getting in the valve as the air going in keeps it clear.

 

[Pindie]

I wouldn’t even use it as tyre paste!