hi neil,
why dont you post some sort of leaflets through their letter boxes and ask them to stay in or out between the time you want to do them,
and use carefree eternum cos it only takes bout 20min tohalf our to dry, open all doors and windows it will dry even quicker for you, remember you cones and put enough other sings for visitors to know what you are doing, that should be ok ,
and hope you dont get an awkward s.o.b. to start trouble with you
thanx jonny
let castle take the hassle