I am wanting to create a framed magnetic notice board for our living/kitchen area. The wall space I want to hang it in is 40cm w x 80cm tall (so wanting to place the magnetic sheet in a frame approx 30x60). I am thinking I want to use the Bunnings product: Australian Handyman Supplies 600 x 300 x 0.55mm Galvabond Mini Sheet for the board itself, but I want to ensure 1) it's paintable (as I want a different colour to the metal) and 2) that it actually is magnetic! Thanks ! (see link for inspo https://www.instagram.com/reels/DYCgzUhocrt/)