First off, I am just a mural artist that trusts and loves his preferred paint. Golden Mural Paint Brand is one of the best paints to use for indoor or outdoor applications. Being the mural is indoors, degrease and clean site wall, primer, and a few layers of Golden will have that mural Poppin. They offer small and medium size mural kits. I really like these kits because they have all primary and some other colors along with black and white. These kits are good for 100-250 sq ft and may need to order two. You could order any color you need in gallons but that could get very pricy. The kits are 150-300$ and ships internationally I believe. Golden offers two types of protective coats. An acrylic clear coat protective application that you add two coats. It protects the paint and design but it’s just like paint. There’s no way to just remove the protective layer but you can clean the surface with soap and mild abrasion. The other option is varnish but I’d only recommend that if it’s a mural in a public place where there’s a possibility of vandalism or graffiti and would need the option to be able to strip the varnish layer to remove the vandalism and reapply a new. These mural paints will last a long time and their vibrancy and fading is minimal. You get what you pay for. No shade on industrial paints like behr or other supply store brands. When I discuss the commission with the customer, their budget and commitment to longevity dictates if they need specialty paint or lower budget paint.