Seeking Advice: Having "The Talk" with a Contractor

[Derek Gibbs]

I am having a contractor paint the common areas and install new flooring and lighting in my apartment buildings. The contractor was recommended by a another local investor and it's our first time working together. 

After they finished painting, I did a walk through and the quality of the work is not very good. The walls have lots of debris in them, the doors are only one coat and you can see through some of it. There is a railing post that was completely missed on one side, etc.

I mentioned some things to them already such as repairs that weren't sanded and painted over and they fixed them but I feel like I need to have a sit down and ask if this is what they intend moving forward? If so, maybe we need to end our relationship now.

I really wanted to go with another painter who I liked better but these guys can do the flooring as well and I couldn't find a good flooring contractor separately so I chose them.

Anyway, any advice on how to approach this topic with the contractor?

Thanks,

Derek