Alternatively - if you see client would likely need more of your help - maintain good connection without negative sparkles, but for any further gigs request 100

Alternatively - if you see client would likely need more of your help - maintain good connection without negative sparkles, but for any further gigs request 100% of your fee upfront. I did it a few times with unruly clients. When I receive 100% check - i deposit it but do not use money whatsoever until project is fully implemented to keep myself disciplined too :)