The magnetic blackboard is a sheet of galvanised metal and its more than chalkboard paint. So, you can make your magnetic chalkboard with the use of a utility knife to cut the galvanised metal into size. Next, you need to rub the coarse steel wool across the surface. Later, with the use of the paintbrush, you need to apply the ageing solution. And let it dry properly. You can use steel wool again to lighten areas that are too dark. So, after the primer dries, you need to sand the surface. Now, apply one coat of latex chalkboard paint and dry it. Repeat the second coat in the same manner and remove the tape, carefully. Now, with the help of the driller, fix it on the wall. Thus, you need to cut pieces of adhesive magnetic sheet to size. And stick it behind the eraser and holder.