Painting???

Question

my mum is painting the passage and the walls have been platered so there smooth but the thing is its showing patches everywhere and it dont look right? its not cuz its drying cuz u can still see it next day!! is there a special way to paint or a specific paint brush or roller!

Many Thanks

Answer 1

are you sure the plaster is dry if its not you will see patches were the plaster has not dried out properly

Answer 2

There is no primer for new plaster.  So trained decorators will water down the first coat of emulsion by as much as 50 percent to thin the paint so it soaks in and gets some kind of grab on the wall.  Sometimes plasterers over trowel the finish and it is so dense and shiny nothing soaks in and grips it so a specialist primer like Bullseye 123 can be used on bare surfaces where the paint has peeled off.

(Contrary to the advice previous given you do not 'seal' new plaster with anything.  You want a thinned emulsion that soaks in and nothing that lays on the surface. )

The finish skim coat of plaster will only have been 5 or so millimetres thick and will have dried out after a few days.  However, if there are places where they first used sand and cement render then those areas will be drying for many months and an emulsion with no vinyl content should have been used to facilitate the drying process.

So you either have patches that are drying out or stains which need sealing back.

Answer 3

Always use a primer on new plaster walls as the plaster needs to be sealed before the top coats go on.

Answer 4

If it`s new plaster it`s best to do a first coat of diluted emulsion,say 1 part emulsion to 4 parts water,but if your mum has already done 1 coat another should give a good finish.Try using a sheepswool roller,they`re a bit pricey but do a great job.

Answer 5

another 2 coats of emulsion will do. if it still looks patchy then i dont think the new plaster was completely dry.if this does happen, coat the walls with an oil based undercoat, then 1 coat of emulsion with a good quality roller available at your nearest dulux decorator centre ( try a lifetimer, not to dear but still good quality ). as for a brush i recomend a purdy monarch elite 3 inch ( expensive for diy, but you wont get any better ).

p.s. 24 years as a decorator

Answer 6

You might try some sort of textured paint or sponge painting.  If it is a new wall, you should prime it first as the plaster absorbs the paint in different amounts depending on how the wall was smoothed.

Answer 7

any decent roller and brush will do the job, you may need 3 coats on new plaster, and don't spread it to thin. I'm a decorator do you want me to come and do it for you.

Answer 8

If it's new plaster it should be sealed first,if its old plaster it is probably old wall paper paste and if its a combination of both(repaired patches)it should have lining paper on before the paint hope this helps