After more than twenty-five years working in paint and coatings plants, I’ve seen foam turn what should have been a straightforward production run into a long day of rejects and rework. It doesn’t matter how good the pigment dispersion or resin system is — if persistent foam carries through to the finished paint, you end up with pinholes, craters, poor flow, and unhappy customers. Defoamer are the additives that quietly prevent most of these problems, but only when you choose the right type and use it correctly.