how to remove black marks from a plasterboard bathroom ceilingdue to frequent steam from showers?

Question

marks return after frequent repainting with ceiling emulsion

Answer 1

thin bleach will kill the mould, and make the stains lighter. then paint over it with bathroom paint.

Answer 2

Hi - The paint you want is Perma-white. It can be tinted if you want a colour. Treat the mould as suggested by others and apply two coats. You must not apply ordinary emulsion over this paint otherwise you are back to square one. I've a shower-room ceiling that was painted with Perma-white 8-9 years ago and no sign of any mould since. If the ceiling gets dirty you can even use a scrubbing brush to clean it. It's not a cheap paint but well worth the extra cost. It's also ideal for kitchens.

Answer 3

There is a special paint you can buy to seal the ceiling and you then emulsion over that in the normal way.
The best way to avoid the black marks after that is to open the bathroom window if there is one, or the door if there isn't after you've taken a shower. Mould simply cannot get started in a well aired room.

Answer 4

You may need to go one step further before this gets resolved properly... if you can clean or scrape off the old paint some and then bleach you are going to be better off... mold can be unhealthy and cause breathing problems, but after you have done the best clean up you can do, then use a blocker paint, there is one called Kilz that I think is the best, but make sure you have time for all of this to dry out really well as you move from step to step. the Kilz comes in a water base and an oil base, if possible you should use the oil base and open up all the windows and get this thing dried out after that you can just wipe it down. Also, shower rooms should have a good exhause vent to get the steam out after your shower to prevent this type of damage.

Answer 5

The black marks are actually mould. You need to scrape off the marks and treat the area with an anti fungicidal wash (available at most hardware stores). Once you have done this you can then repaint the ceiling using an anti mould paint. I know wickes stock it because I bought some for our new shower room yesterday but if you are not in England you will probably have to ask for it.

Answer 6

Use a utility knife (box cutter) and a putty knife to remove the old caulk. If your old caulk is not siliconized acrylic (if it is hard as a rock) Home Cheapo sells a product called "caulk softener" that will make it a lot easier to remove. Keeping caulk from getting moldy is a tough one. Mold and mildew thrive on warm and wet, which is what every shower area has. Lysol kills mold on contact, so do some of these "Tilex" and "Scrub Free" type cleaners. Don't spray those things on your faucets. My method for getting rid of the mold is caulking the tub every couple of years.

Answer 7

There's a latex type paint around specially for steamy damp areas - dammed if I can think of the name of it though! Have a wander round your local DIY store - they will have it. You put a coat on then just emulsion over it. Damp something?? Sorry - just can't remember!

Answer 8

The cheapest and most convenient way to do this - all professionals do it - is to paint it with white oil based undercoat. - do this twice and then emulsion over the top - bye bye to black mold.

Answer 9

firstly you need more ventilation or you will just have to keep removing it then you need to paint the ceiling etc with anti condesation paint called seculate (in the uk) this has very fine pieces of cork in it which keeps the ceiling warm so condensation doesnt happen

Answer 10

Polycell Stain block will solve the redecorating problems. To stop it reoccurring on the new paint you may need to install a good extractor fan.

Answer 11

Well...you have to scrape the old black moldy stuff away till its white again or cut the area required out. then puddy it with (spackle,drywall filler)then sand it reaching up all the time???then paint it.