Advice on eliminating edge mapping or ‘feather edge splitting’ from Axalta.
Edge mapping or ‘feather edge splitting’ is a frustrating defect that appears as a halo where sanded edges or old repairs show through fresh paint. It’s one of the most common issues in collision repair and often comes down to poor preparation or rushed priming.
Typical causes include heavy primer application that traps solvents, incorrect activator or reducer selection, coarse sanding, or not allowing primers enough time to cure. The result? – a disrupted finish that reflects poorly on your workshop’s standards.
Prevention lies in discipline and process. Always begin with a sound, well-prepped substrate, then sand evenly and clean thoroughly before isolating with primer filler. Allow the primer to fully cure (don’t rush this step!) and block sand to a smooth finish. A guide coat helps highlight imperfections before final sanding with finer grits. Done right, this creates the perfect foundation for colour application.
It’s also worth remembering that every stage of preparation impacts the next. Skipping even a small detail, such as using the right sanding grit or giving solvents enough time to evaporate, can undo hours of work further down the line. By treating surface prep with the same care as colour application, you’ll not only avoid defects like edge mapping but also set a higher benchmark for quality across your entire workshop.
By investing time up front, you avoid costly re-dos and deliver the smooth, professional finishes your customers expect. And if edge mapping is still giving you headaches, Axalta offers training to help your team refine prep and priming techniques for consistent results.
Contact your local Axalta representative for tailored training and support on 1800 292 852.