I am presently emulsioning ( white V/Matt) newly plasterboarded walls in my bathroom and having a slight problem with the joins where I used Gyproc Joint Filer which dries a sort of beige/cream colour . ...It takes a fair bit to get to the stage where it stops showing through . Is there a product that I can use to put on as the first coat to kill the filler showing through .? tia
Stuart .