Engine Bay Paint
The current short term tests for qualifying (approving) 2K clear coats are boiling water and Zenon Arc. Both will tell you very quickly if a clearcoat is going to discolor. Long term tests are weather exposure testing in a hot climate such as Florida or Arizon. (up to 5 years). The top tier refinish paint suppliers test their products to these specs. The cheaper brands may not so be careful.
