I do like, I stopped brushing years ago. My dentist hated me! No I made a pusher and have worked out my coating amount spot on. Well done with the print.
I guess I'm a weird sort of brushcoater in that I use a drinking straw as a pipette to roughly measure out and put a line on the paper of sensitiser then brush it across. I don't pour it into a dish and sop it around or anything.