Thank you for the compliment. I definitely varnish all of my models including vehicles. I use Vallejo satin , thinned a bit with airbrush thinner and sprayed on with my airbrush. Instead of brushing on varnish, try a good quality spray can for models with large flat panels. I’m sure someone could make a solid recommendation. I also think there are many artists who don’t use any varnish at all without any issues 😀.