I am shortly to repaint a number of plain flush panel internal doors. The present gloss has been very well sanded then washed with sugar soap solution and properly rinsed. I want to apply Crown Solo brilliant white. Normally I use a 3 or 4 inch brush and with a bit of care can produce a good final result. But it does take me a long time to get the finish I want. So, I was wondering about trying a roller and hopefully speed things up a little. Is this a good idea for a plain flat surface? Or is it best to stick with a brush? Any guidance would be very much appreciated.