I am painting a room where the previous paint job was not very good. You can see brush marks from a great distance, it got all over the trim, and the paint looked watered down (thanks builders). It was an earthy portabello color and it was flat paint. I am going to paint over it with Sherwin Williams Duration (Satin) in another earthy color (earthy green instead of brown). I probably have enough for 2 coats.
First I tried to sand the walls but could not get them smooth, after about 5-6 hours of sanding I gave up and applied a coat of tinted Sherwin Williams multi-purpose latex primer. I can see both the brush strokes left by the builders and new brush strokes and roller marks left by me. Sanding it with low grain sponge isn't really helping the situation. Also the single coat of primer can still show a hint of the previous paint in a few spaces.
My question is that if I apply my 2 coats of Duration over this primer job using proper painting techniques (I have been doing my research so I don't make the same mistakes I made with the primer again with the actual paint), will it likely cover up the mistakes? What should I do here?