Hello,
You can use either.
It depends on your individual preference, working space etc.
Typically, for a streak free finish you'd use a roller. But for hard to reach areas/edges or detailed areas you may wish to use a brush. Also, if the metal you are painting is rough then you might want to use a brush, as the roller wont have long enough pile to reach every divot.
For further information you may wish to visit some DIY advice website online (you can find helpful videos too) or contact a competent tradeperson for help.
Thanks for using Q&A.
Answered by: DGIFF
Date published: 2020-08-12