Benjamin Moore paint over Behr for trim
Need a good sash and trim brush to start. Expect to pay $15-20 for a nice angled one. 2.5-3" were the sizes I used most. A good brush, taken care of, will last a long time.
You cannot really "fix" applied primer or paint from the top down. Your adhesion for everything is ultimately only as good as the bottom layer.
As mentioned, semi-gloss does take 30 days to cure so be patient to see what you really have.
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