[rnln]

oh wow, look like you just saved me from doing the same thing. I plan to paint my whole house with one stage, paint with primer ready, from either homedpot or dun-edward. I do notice some area in my house has very shinny surface. I assume it's either gloss or semi-gloss.
Now question is, do I really need to sand the wall first and a coat of primer, or either one of the two is fine?
Thanks.