No leakage and no top-ups needed after weeks, and as I found out the hard way, it works to seal tires great. In the end I didn't need to do that and it still worked like a charm. I also sounded him out about using it as a tubeless sealant and he stated they had never heard of it being done, and it should work if I painted the tire beads in advance with some to help ensure a seal. This conversation, which I reported pretty widely at the time, is where the 16 oz dose for a fat tire comes from. He confirmed the Sportsman Formula was the one they had tested with BackCou ebikes. I called FlatOut on the phone and got their product manager in charge of dealing with bike compatibility. When I changed wheels a few weeks later, I found the hole in the tube had dried into a hard nub, unlike Slime which leaves an often-weepy soft plug that may be still leaking air very slowly. By the time I got stopped, the 4.3" Surly Edna tire was essentially flat. Oddly it was the same cargo bike a few weeks earlier on my street wheels which were running with tubes. On the fourth air refill the last of the hissing stopped and the tires have stayed inflated ever since. Then rode the bike about a block until I needed another refill, and repeated that three times as the air escaping slowly decreased. Thankfully my bike-battery-powered air compressor always goes with me as I spun the tires but was losing so much air, I needed a refill. Tires were Snowshoe XLs (and they were running tubeless) on a cargo bike coming back loaded from a Home Depot run. a strip of 6 roofing nails from a nailgun. After some major events where I know Slime couldn't have coped, I replaced my Slimed tubes I have with others that have FlatOut in them.
Officially its 'up to 10 years' but that translates to 'life of the tire'įlatOut is, hands-down, better than Slime.