"Won't stop a gusher" - Review of Hutchinson Protect'Air Tubeless Sealant
I have had great luck with Protect'Air Tubeless Sealan. It has fixed many a flat from goat heads. I found if you put your finger over the hole it helps seal it faster. Holes about the size of a pencil you won't be able to seal though. I prefer this over stans, seems to last longer and seal faster.
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