Jeremy's comment of walk in and ask is very true
We had a local store that I know the owner. The owner thought I only cleaned carpet. He just had his vct refinished. I asked him if the job was completed, he says yes. I tell him I can make it look 100% better if he would give me a few minutes after hours.
He gives me a key and that night I take in the propane buffer. Buffed the floor for a few minutes and left. The guy that refinished the floor lost that job. Still doing that account 5 years later.