How are paint companies e.g. testing their products for a substained amount of time succesfully? Are they really painting a house and then wait 15 years to see the result?
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As others have said, accelerated aging with temperature, humidity and uv exposure is done for a quick(er) feel for how things will hold up.
But I worked for a company that made paint binders, and we had a huge field with racks of painted samples – wooden boards, metal panels, etc, all just sitting exposed to the weather. Some of the samples were 20 years old. When folks retired, they briefed a younger chemist on what they had on exposure.
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