Adhesion testing is a standard part of professional painting-metal-roofing-singapore. Before starting the full job, a "cross-hatch" test may be performed on a small section to see how well the new paint bonds to the old surface. If the old paint is chalking or peeling, it must be completely removed. This technical step ensures that the client isn't just paying for a temporary cosmetic... https://kkroofspecialist.com.sg/painting-metal-roofing-singapore/