They could make tires for vehicles and anything else last for decades, but then they'd sell them once and no one would ever come back. But that's not my point. My point is what we've been used to for signs, not freak happenings for other things.
Signs have been around a long time and were believed to last more than a half dozen years at best. It's almost embarrassing when people ask, how long will this lettering on my truck or my sign or anywhere last ?? Ya hafta go into which way the sun hits it, is it gonna get hit with a lotta snow or ice, will anyone be cleaning or touching it, how close to the equator do you live........ just so many particulars, it's just ridiculous.