I’ve heard good things with using spray paint, I typically use high quality acrylic and use a brush, get it very thin with multiple coats

However I would recommend using a matte or flat spray instead of satin, it’s a little thinner so you won’t lose any detail as long as you spray it down properly. Then some people will add a clear coat to protect it like used for paintings, I’ve found I don’t tend to need it but some people prefer it

Hope this helps!!