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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When i worked in R&D at a paint company they tested using several methods. The most natural test was painting several samples on various materials and leaving them outside facing south with a 45° angle. This was done in many locations in the country and those samples were studied over time.
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