Painting - damp/mould problem

[Miss Inquiry]

I have just painted a chimney breast in my house and a stain/pattern that used to be visible has come through again. I have consulted various decorators and no one can ascertain what the stain is, it is in a pattern and looks like the underlying wallpaper could be damp and is pushing the stain/pattern through in 1 particular area, but the damp is halfway up the chimney breast, which seems odd. Does anyone know if they is anything I can do to stop the pattern/damp/stain from coming through again. I am painting on top of woodchip (yuck-until I save up my pennies it has to stay) so ideally don't want to take the paper off and treat the actual wall.
Any suggestions?

[jake-the-peg]

Paint BIN primer over it , let it dry and then paint over that.

http://www.decoratingdirect.co.uk/viewprod/z/Z INBIN/

You might not get it at your local DIY megastore but you'll get it at a specialist paint shop or order it online at that link.

It's a shellac base and stops stains coming through

[muchlovex]

it sounds like you have damp in the chimney breast. The chimney should ideally have air circulating the whole fule. You may want to get this checked out.

Have you got airvents near the chimney breast, either interior or exterior? Or perhaps something has fallen to the bottom of your chimney and therefore stopping the airflow from circulating.

[auzzie]

We have tanked our cellar and i have just painted the walls magnolia. Previous to this was a victorian cream colour. (way too white!). Since putting the magnolia paint on, we too, have about 5 small stain marks, on one wall, in the same area? How perculiar.
It looks like damp patches but we know the walls are not damp, even though it is a cellar.

[Miss Inquiry]

Thanks for all your comments, I will get the chimney checked out, thanks for the hint, and I am going to order the BIN paint right now.

I have only just bought the house, so I feel there will be 100's of DIY questions like this popping up from me in the future.

Auzzie, I hope you figure out how to get rid of the stains too.

[auzzie]

Me too, Miss inquiry. We are in the process of selling!!!

[jake-the-peg]

Watch it when you open the BIN Primer, it's a lot thinner than you think it's going to be and I nearly threw it all over myself when I did it last

- which would have been a mistake