Every technician has experienced a sticky or tacky finish in their career. This typically happens when the paint hasn’t dried properly—not to mention the number of other defects that are likely to occur. While it’s best practice to wait until coats are fully cured or at least beyond their drying time, there are a few other factors that could affect the painting process. Here are a few reasons (and fixes) if your car paint won’t dry.
While waterborne paints are more commonly used today, understanding how humidity and temperature affect water and solvent paints are important.
Heat burns out moisture in the air, making it a favorable environment for solvent paints to dry. However, little to no humidity can also make it difficult to apply water paints (after all… it is water). Sometimes a little humidity makes it easy to apply water paint, but then makes it harder to dry because of the moisture, therefore making the already wet paint remain wet. For this reason, it’s valuable to be able to control humidity within a paint booth to increase and decrease levels depending on where you are in the painting process.
Temperature plays a huge role for both solvent and water paints. For solvent paints, too hot of a temperature will dry the coating too fast and cause wrinkles or cracking. A technician may also think since the coating is dry on the surface level, they can apply the next layer causing it to become too thick. The problem here being the tech has now stacked material on top of material that isn’t completely cured. This can result in delamination issues down the road, solvent pop, and other issues.
Too cold of a temperature will prevent chemical cross linking, which is important for the effectiveness between coatings, primers, and hardeners. Regarding waterborne paints, water dries by dehydrating and evaporating water out of the air, which is why low humidity and higher temperatures are extremely effective between coatings.
Pro-tip: Install the Accudraft Xcelerator, which accelerates waterborne dry times in half.
The Accudraft sales team can help you determine your goals. For example, is your biggest issue output or time? Would you like to expand your vehicle mix or better improve your current floors production? Are you looking to upgrade an existing finishing system or install a new setup? Call us to talk through these key factors and more! We can discuss your shop needs and help pair you with the right finishing system set up.
Call 1-800-524-0340 or contact us online.