I have found great differences in the time it takes for sidewalls to seal tubeless...
- WTB Riddler 37s were terrible...they oozed for weeks before I finally gave up and sold them to a friend that prefers tubes (it's too bad, because they had a great road feel).
- Panaracer 35s took a couple of days to stop oozing, but they have been pretty good over the long haul. Had a ~1cm cut in one and managed to ride 5 more miles home, but had sealant on the backs of my legs and all over the back half of the bike.
- A pair of Continental Terra Speed 35 tires just never sealed completely. They would lose 2-3 PSI in a couple hours of riding and 10 PSI overnite. Didn't give me a lot of confidence.
- I just mounted a pair of Specialized Roubaix on a new set of HUNT wheels, and oddly one of the tires sealed up right away and the other is finally sealing after three days of sidewall oozing/frothing.
self-explanatory...the sealing process was done in parallel!