there you go a nice flat white paint!If the wall is painted white (like most are) then just leave it like that.
It not the light that leaking out thats the problem. It's light leaking in during dark cycle. If you have light leaking out, then you definately got light leaking in. So you'll have to get that sorted for flower.another question. is it important that no LIGHT leak out? even a slim line thru the edge of a door?
lmaoi remember when i used to play hockey i spray painted my locker room for y team and the smelll went all the way to the rink