I recently started using gemplers ultraseal.... Following 3 flats on one job in a week. It is now in the tires of all my rolling gear. The first job I did after filling the tire was to load 60 yards of mixed household trash and fire debris. This was in my power trac 1850. It's articulating steering is especially hard on tires. I pulled BIG nails, 2" embedded glass even a thumb sized stick. No flats. I'm fully sold on the stuff.
It stays fluid and is far more comfortable than solid, foam tires.
Ultraseal is not like green slime and other box store type products. It does not rust rims.
The pump is a bit expensive but a big help.
I could be convinced to lend mine for postage and a deposit...