Ive used Slime and another brand in a white gallon container. Both worked for me. I don't know if either are supporting corrosion as some have said (problems claimed to be related to sealant goo) as I haven't had the tires off to look and see.
On my lawn mowers, I insist on a soft ride and part of that is low air pressure in the tires, like 6-8 psig. On older tires that don't seal at the rims all that well, especially ZT fronts, I liberally apply "belt dressing" on the sealing surfaces prior to airing up and it seems to do a fine job of solving that problem.