chris French wrote:

Emulsions seems much of a much-ness re dripping. a brush will be less
messy than a roller, you tend to get a bit of a spray from a roller.,
but harder work and slower. I generally prefer to use a roller on a pole
so I can do it from the floor. A hat keeps it out of your heair.

Big paint pads on a long handle work very well - smoother and faster
than a brush, and no spray.