Workshop wonders 41 www.aftermarketonline.net JULY/AUGUST 2025 øøøĥ¼ÁÇÁìݲ ÈèáĥÎĥì¾ GARAGE APPROVED As temperatures rise, automotive refinishing becomes more challenging. High heat can impact everything from product performance to application results. To help refinishers maintain top-quality results through the summer months, Sherwin-Williams has compiled some essential tips and practices to keep your finishes flawless and your shop efficient, even in the hottest conditions. Choose the right hardener and thinner One of the most critical steps in summer refinishing is selecting the correct hardener and thinner based on ambient temperature. Slow hardeners and thinners are specifically formulated for higher temperatures, allowing for proper flow and levelling without rushing the cure process. However, consistency is key. If you opt for a slower hardener, always pair it with the matching thinner. Mixing mismatched components can lead to gloss retention issues or undesirable surface imperfections. Be sure to consult the product’s technical data sheet (TDS) if unsure. Minimise thinner use in clear coats When working with clear coats in high heat, it’s best to use the minimum amount of thinner permitted by the mixing ratio. Excessive thinner, especially in hot conditions, can cause the clear coat to dry too quickly, leading to dry spray or poor flow. Staying within the lower range of the TDS-specified ratio helps to maintain better control and finish quality. Avoid direct sunlight on products Never store paint products, thinners, or hardeners in direct sunlight. Exposure to heat and UV rays can change a product’s viscosity and chemical balance, affecting its performance. Always keep materials in a cool, shaded storage area, ideally within the temperature range specified by the manufacturer. Also, remember to replace the lid on hardeners as soon as possible after pouring. Cool down spray booth between jobs Spray booth temperatures can rise significantly after each job, especially during back-to-back work in the summer. Cooling down the booth between cycles is essential to avoid carry-over heat affecting the next application. Overheated panels can make it difficult for the paint to stay wet, leading to uneven finishes or dry spray. Use larger nozzle at high temperatures In hotter environments, switching to the largest nozzle setup recommended in the TDS can make a noticeable difference. A larger nozzle allows for greater material output, which helps the paint remain wet on the surface and improves coverage. This is especially important for basecoats and clear coats where a consistent, wet film is crucial. Use an anti-static cleaner for final wipes Summer heat often comes with dry, dusty conditions. Static charges on panels can attract fine dirt and debris, compromising the finish. Using an antistatic cleaner as a final wipe reduces the attraction of dust and results in a cleaner, more professional outcome. Mix per layer for larger repairs For larger repairs in high temperatures, we recommend mixing product per layer rather than preparing a full batch. Heat accelerates curing, shortening pot life and changing viscosity mid-application. By mixing fresh product for each coat, you maintain the correct consistency and avoid issues like clumping, uneven coverage, or product waste. Sherwin-Williams offers a full range of temperature-appropriate products and expert support, no matter the season. Visit www.sherwin-williams.com for details. Products and tips for SHUIHFW VXPPHU ᎮQLVK
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