I’ve got the new Biofibre sealant, thought I’d give it a punt as I was fitting a new set of tyres and ran out of Mucoff sealant – just happened to see the Guy Kes video that evening too! Wouldn’t have touched the older original version.
I rode the SDW a couple of weeks ago and got a hole (only a couple of mm) in my rear tyre about 70 miles in, the sealant acted really quickly, sealing in a couple of seconds and was fine for the rest of the ride, with no noticeable pressure loss at all. Have been out a couple of times since and no issues. Does what it’s meant to do, whether it’s any better than Mucoff, Stans or Orange, I’ll see in the months to come!