I ran a bead of acrylic sealant along my sun-baked skirting at 2pm just to be finished before dinner: three days later, running a nail down the line, I understood what the heat had pulled apart
You applied sealant on a sun-baked skirting board and it looked perfect—until a nail revealed the truth. Heat forces the surface to skin over while the interior remains soft, creating a hollow crust that fails days later. Understanding why this happens, and how to fix it, requires knowing more than just technique.