ORIGINAL: j boy
A professional would never accept a flawed take and then polish the turd. Wouldn't happen. It's a bad habit to get into. I find it really hard to believe that if the project is worth the effort you can't re-track a part. What, did the guitarist lose his arm in an accident? If the project is worth the effort then re-take the flawed part. Simple as that.
Well, I am not a professional, yet

LOL! I know next time to correct the situation from the source. He didn't lose his arm but he is very lazy when it comes to re-doing guitar parts. If I couldn't fix it in the mix, I was going to scrape the whole song. I agree with you 100%. Also, just to clarify...he isn't MY guitarist. The guitarist in my band would know better than to let that slide