Hello, I think it's better if I post this question here on a new thread. In summary, I have walls that have been painted with 3 coats of Farrow & Ball paints. They are very even and very smooth. I need to apply a 4th coat due to technical reasons. Can I use a roller with short nap like 1/4" to apply this 4th coat? Or would this be too short? I want to maintain the smooth uniform surface that it currently has. Thank you in advance.