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Tire sunscreen is just what the name implies.
Tire manufacturers are always improving the compounding of tires for better characteristics, but one thing has plagued them all-- that is dry rot from sun exposure and just sitting. It can happen to even new tires in the tire store.
They include tire sunscreen into each tire, Michelin includes the most to protect their tires. Cheap brands use very little.
Michelin tire manufacturing is almost art, not science. If you ever grab a Michelin tire on the inside (used or new), you will have sunscreen on your hand. When all tires roll, the sunscreen makes its way to the surface to protect the tire.
There is a German tire manufacturer for 2 wheeled vehicles that builds very close to Michelin quality.
When it sits, no sunscreen moves to the surface, so no protection. The tire gets surface cracks, dry rots and is completely unsafe. Another side effect of no sunscreen is the tire rubber gets extremely hard and no longer grips the road - very dangerous even in nice weather.
Some products like "Tire Black", and "Tire Dressing" have it in them, just read the ingredients to confirm. There is debate about Armorall, I'll let you decide on it.
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