All frames should be chased and faced, allthough I know some people have forgone the procedure. The paint and metal reside in the BB shell threads can cause issues when installing the BB. Paint on the outside of the shell can cause the BB not to line up flush with the shell causing serious issues. A lot of frame manafactures do this prep work before selling the frame, but discount frame makers do not. You can tell simply by looking closely or asking the seller. Expect to pay $50 at the LBS.