I found Berryman brand tire sealer in 5 gallon buckets for $100 at o'Reilley's -- the same stuff is $40 a gallon at TSC.
Gempler's has another version that runs about $60/gallon, but it's supposed to fill up to 1/4" holes - not just punctures.
Since my 3510 needs about 7 quarts per back tire, I...