Getting a complaint is never fun. Your chemists work hard to develop just the right formula for a coating or adhesive and when it fails to cure properly, peels or separates from a product, either during or after the manufacturing process is complete, it's your company that bears the brunt of the responsibility and whose reputation is tarnished.
While a quality inspector periodically checks samples during the beginning, middle and end of the process, and production operators do radiometer testing, the end product must be uniform and the cure consistent, or what appeared to be correct at the beginning of a run can look very different at the end. If you're lucky and you catch a problem, you'll only have to explain a small amount of waste to your customer, but if the product ships and the quality is not up to the customer's expectations, you're at risk of having them go somewhere else.