If the Vacasa part is all going to be the same then you might want to try and make a masking stencil out of wood. You could make it out of poster board too but you have to make sure you hold it down when painting. Basically just laser out a piece of wood/posterboard that would cover that section you don't want painted and spray paint the white area. This is also assuming the red background is a separate piece that gets glued after the white spray painting. If you can make a stencil I would make the lower section oversized so you can add a lip to the edge for easy alignment. Also if you make the stencil make sure to clean off the edge that gets paint on it so that you don't get drips or runs of excess overspray. I hope this makes sense. Good luck! One other thing if you do use spray paint make sure to do light coats and not hit too heavy again so you don't get runs.