footprints Joined 21 Sep 2011 Messages 4,768 Reaction score 1,130 Country 4 Feb 2022 #2 Its an old water stain (unless it is a current leak) You need a couple of coats of a good stain blocker any DIY store will have a selection, for a small area like that some Zinsser BIN would be ideal, available in brush or spray can.
Its an old water stain (unless it is a current leak) You need a couple of coats of a good stain blocker any DIY store will have a selection, for a small area like that some Zinsser BIN would be ideal, available in brush or spray can.