Painting over old matt white paint with same type of matt emulsion do I need to sand?

diystarter7

It's all solid and good and about 7 years old. I just want to make it brighter again do I need to sand. Looking on the net can't really find the answer as they talk about painting different paints etc

casper_gutman

Woodwork is a different matter, but when painting emulsion on walls I've never bothered doing anything special to roughen or key existing paint and this never seems to have caused any issues.

I'd just clean the wall down with sugar soap solution (or TBH I've used a few drops of washing up liquid in water before now), then rinse and allow to dry. Given that this has always worked out fine even when using different colours/brands of paint, I definitely wouldn't worry with another coat of the same type and shade.

Afourteen

Wash down with sugar soap and 'rinse' off. Run down any loose paint areas. Once dry you should be able to apply paint without further preparation. 

diystarter7

Thanks both. I have no sugary soap but will light sand and paint Thursday. The paint is in hall ceiing and was painted onto new ceeiling 7 years ago and it is all solid and smoke,grease free but will lightly sand.

I do I have that Zinner paint but won't put that on.  I painted the hall walls last week and we have lining paper and the paint went straight on but this is plaster but from reading between the lines of your posts I should be ok. Thanks

casper_gutman

If you do sand it, be sure to remove loose dust afterwards. Traditionally you might use a tack cloth but I'd probably wipe it over with plain water and leave to dry before painting.

diystarter7

Thank you. I've sanded earlier today and just a quick, dry wipe. As I said it is solid and only gone off a little. I painted the walls the other day and it was hardly noticed but then I thought might as well re-do the ceiling.
Thanks all.