How to Avoid Orange Peel When Spray Painting?
2 Answers
Paint orange peel phenomenon is actually caused by dry spray of paint, mainly due to high paint viscosity. Here are specific methods to prevent orange peel when spray painting: 1. Thinner: Appropriately add matching special thinner; also, properly reduce the spray gun pressure; the distance between the nozzle and the painted surface should be about 30cm, and spray vertically. 2. Hardener: Adding too much hardener may also cause orange peel, so the amount of hardener should be appropriately reduced. 3. Adjust boiling point: If the temperature of the painted surface or the ambient temperature is too high, causing the thinner to evaporate too quickly after spraying, leading to resin loss and pigment accumulation, resulting in orange peel, adjusting the ratio of thinners with different boiling points can alleviate this phenomenon.
Paint mixing and spraying techniques are crucial. I've used three methods to prevent orange peel: the thinner ratio must be precise, as too thick can cause wrinkles. Maintain a spray gun distance of about 20 cm, moving at a steady speed like misting. Set the air pressure to 1.5-2.0 bar for the most stable results; previously, excessive pressure caused the paint to dry before leveling. Ambient temperature is also important, with around 25°C being ideal. In winter, preheat the garage for half an hour before spraying. Finally, remember to apply three thin coats, allowing 10 minutes of drying time between each, resulting in a smooth, glass-like finish. DIY enthusiasts should wear a respirator and not skimp on ventilation fans.
