To get the ball rolling, in my case it was varnishing the banisters in the new stairwell. Oiling them is easy since you can wipe it on, but varnishing looked to be a huge pain because of all the curved trim that needed careful painting around, I couldn't just lay it on with a cheap foam brush. Traditionally the way to paint on an oil-based varnish is to use your grandfather's unicorn-hair brush while dancing naked under a full moon or something similar, but modern SRT brushes are perfect for oil-based varnishes as long as you thin them slightly before applying and ignore all the advice telling you they're for water-based paints/varnishes only and you need to wait for a full moon for oil-based ones. So a really awful job turned out to be no harder than a standard paint job.