Humidity Affects Paint Drying

Ask an Expert From: Products Finishing,

Posted on: 10/1/2005

Question: Concerning the question in the July 2005, Painting Clinic, regarding the gentleman, D.


Concerning the question in the July 2005, Painting Clinic, regarding the gentleman, D. W., experiencing paint drying problems during the winter (low R. H.) months: Many manufacturers of “Moisture Cured” polyurethane paints also offer a catalyst that will provide the necessary reaction to complete the drying process. This is especially helpful if you have a very large paint bay or a booth where high volume of air turn-over makes it difficult to keep moisture content at a constant level. The downfall of using a catalyst is that the paint usually has a shorter pot-life than is normally specified in their literature. Individual users will need to weigh the benefits and drawbacks for their particular situation. But I would recommend checking with their paint manufacturer. R. A.


Thank you for your comments, R. A. I couldn’t have said it any better. After reviewing his e-mail, it is obvious D. W. works for a smaller manufacturer whose account is not important to the paint supplier. From your e-mail, I see you work for a large company, as I did when I had a real job. Because of the volume of paint the larger companies buy, the paint suppliers are ever present. We had a guy who practically lived at one of our plants (they made refrigerators and freezers). I worked at the corporate Research Labs and really didn’t buy any paint, but I tested and recommended it. I used to have to beat paint suppliers away from my door. After I became a consultant, I realized the smaller accounts rarely see their paint suppliers. As a result, folks like D. W. have to ask around to get answers to questions their paint supplier should have addressed.

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