I often watch Marco Frisonis videos. He's generally against varnishing your models, because it kills some of the look of the paint job. It's also always really annoying to handle with models that have metal paint on them, since mat varnish will kill the shine, so you kinda have to give the model two different varnishes, but that's a different story.
Generally I paint with lots of inks and contrast paints. Paints that are easily scratched off when handling a model during a game. Lately also using oil paints.
I play warmachine, and it's often really stressful during the last 20 minutes of the game. Models easily get knocked over or bumped by other models in the heat of battle.
So I kinda feel like I need to varnish the models to protect them. What are your opinions on this?