tire rubber preservation

[tire rubber preservation] v This question is relavant to any resto or other fair-weather-only vehicle. v Sometimes I have to replace tires with negligible tread wear just because the sidewalls start dry rotting. [The sort of cracking armor all tends to cause]. What do you put on your tires to blacken
*and preserve*? v I've occasionally had a detailing shop ignore my instructions to
*not* wax the tires. They put this nasty clear slick silicone stuff on which tends to turn a dull brown in a few months and maybe contributes to the armor-all like age acceleration. That's not what I need. I would expect a more acceptible "tire black" to [actually be black for one thing] and protect the rubber from the effects of ozone and ultra-violet light. I need tires to last at least 10 years without the sidewalls dry rotting.

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