Got a customer who I've had for a number of years, they got me originally because I was trad. Couple of months back, they got the wooden windows painted (which they said cost £3000). I left them a note couple of months back to let them know I was going WFP and got a phone call from the bloke going on about how he was worried the excess water would degrade the paintwork early. He was calm but wouldn't take any re-assurance from me that it wouldn't do any damage over time (although I have no real idea if it does or not!). I don't really want to lost them, or go back to tradding them - is there anything I can print off or something like that?