Hi, We are going to hire a painting contractor to paint our 5-room (122sqm) resale HDB flat. We intend to use just one colour for the whole house as we have some budget constraints and we have chosen Nippon 3-in-1 medifresh as we have young children and felt this might be suitable. I have been reading some of the posts and I understand there is another item called sealer which painters have to use before beginning the actual painting. Could someone recommend a good sealer for me? How many can do we need for a 122sqm house(3 rooms, 1 hall, 1 kitchen)? Is there anything else we should be aware of? Other than sealers/paints etc what else would the painter require to do a good job? I guess the contractor can advise himself but then I wish to know beforehand if possible. Thanks in advance!