Professional blue painter's tape is your best bet if you’re looking for clean lines and crisp edges in your paintwork. It can be especially useful if you're trying to create unique stencils or patterns – the possibilities are virtually endless! That said, you must remember to remove the tape before the paint has dried to avoid cracking. While it might seem tedious, it's an essential step towards achieving a great finish.
Just remember to have patience and stay diligent with those final touches, so your walls look perfect when you're done. You should be able to get a roll on Amazon or your local hardware store.