I got a relatively high poly model with faces that aren't in the right orientation. Is there any way to flip all wrong orientated faces but selecting them manually?
After question edit:
I turned down the polys now and merging didn't work either. The model is a letter and currently only a surface, but i want to put a solidify mod on it. I subdivided the surface before for higher res, and now the polys look in the wrong direction which shows when applying the solidifier.