Originally Posted by Mtracer

I use Orange Seal Endurance and live in the desert southwest. So, pretty hot summers. Though my bike is usually in the air conditioned shop space. Anyway, I monitor my sealant level regularly. I checked it about every 6 weeks and almost always add a bit more fresh sealant. Might as well since I have the valve cores out. My bike is ridden multiple times a week, so the sealant isn't sitting in one spot on the tire that long.

I believe adding fresh sealant effectively keeps the older from congealing.

I've never changed out sealant (new for old). But I wear out a set of tires in 6-8 months. On one occasion when replacing a tire, I did find a good size tire booger of hardened sealant. It was more or less a cylinder. It was the diameter of the inside of the tire and about 1.5" long. Never noticed it while riding, so it wasn't a problem.

I don't run tubeless on bikes I don't ride regularly. I would expect sealant to congeal if a tire were unmoved for months.

I think what you are seeing is just the way it is. Check the sealant more often. Top it off and if not using the bike for an extended period, perhaps remove the sealant completely.