Thanks, a pic is a good idea. Will do. No fibreboard underlay in property.
I've just re-painted much of the skirting to see if this will remove the problem"! At the same time I wiped all current traces away! Paul
I have just finished decorating a new extension and seem to have a problem with a "green dust" forming on the newly painted white skirting board!
It forms in small patches and looks awful!
Fortunately it is dry and wipes off with a dry duster. The skirting is MDF, has been primed, undercoated...