ST tires are reportedly made with 5-6 years of UV inhibitors in the materials...
so it's unlikely ANY sprayed on stuff will expand that timeframe....
and virtually impossible for ne1 user of those products to determine IF the stuff makes a difference.
still spray or wipe on stuff does make the tires shiny or appear darker,
and many of us like that look.
imo 303 holds up VERY POORLY to water/washing or movement...
when applied to HARD surfaces like tires.
if 'looks' are indicative of performance, 303 looks good on rolling tires for 1-2 weeks.
i have applied other stuff 2tires that looks good for a lot longer and resists washing longer...
but do NOT think any of these products add to tire life or inhibit the effects of sun or ozone or chemical exposures.
IF u really want MORE tire protection from uv, use covers of some sort (while parked)
all of the true things that i am about to tell you are shameless lies. l.b.j.
we are here on earth to fart around. don't let anybody tell you any different. k.v.