I’ve just refitted my back tyre (Hans Dampf) after cleaning out the almost dried out stans sealant. New sealant in, have done a short ride, all the shaking about stuff, left the wheel horizontal overnight but it’s still losing air. Soapy water test reveals lots of air escaping through sidewalls. The only thing I can think of is that the new sealant is from a bottle that was originally opened about a year ago, does it go off after time? Any other pointers much appreciated…

does it go off after time?

I was wondering this yesterday. I have a bottle of opened Revo Sealant that I was attempting to squeeze into my sons football via a thin valve, but it kept blocking with little clots of latex. The bottles only been open a month. It would still squeeze through a bicycle valve though.

How much sealant did you put in? my advice would be to put 40-50psi in and spin the wheel quite a bit, or go for a short ride. Tilting the wheel while passing it through your hands seems to help too. Bloody Schwalbe.

If it’s definately the sidewalls, then it’s just a case of add more sealant and repeating the shake n bake shuffle.

I had some conti x kings that took ages to seal the sidewalls.

Are the beads definately seated?

Also, I assume you gave the Stans bottle a really good shake? The latex settles very quickly.

Leave the wheel horizontally on a bucket for a few hours on each side, with plenty sealant inside. And yes, it does go off, hence I now only buy the smaller bottle.

Don’t scrape out the old sealant residue next time.

lornholio speaks wise words.

Yes I did shake the bottle, I think the fact that it’s old is part of the problem. Hadn’t considered cleaning out the old stuff would be a factor, will leave in next time. I’ll continue to ride/shake/leave horizontal. Thanks for all the replies.

Have a look at the empty sealant bottle. Does it have a load of sediment at the bottom?

You really need to shake the stuff to get it mixed in before you put it in the tyres

use oko linseal from your local agricultural centre, doesn’t go off over time. if tyre takes a few hours to go down just keep pumping up and riding it will seal eventually.