Stains showing through painted floorboards.

[Cal_D]

Hi,

I'm sure this has been asked before, so point me in the right direction if so!

Last week I painted our hallway floorboards, after a light sanding. I used B&Q's own white floor paint, and after 2 coats noticed some brown stains seeping through.

These stained patches weren't obvious before painting, I never noticed any damp or discolouration in these areas. After a 3rd coat of paint they're already working their way to the top again.

Has anyone any ideas what this could be, or how to overcome it?

I didn't use a primer, as neither of the floor paints I was considering buying suggested to use primer. I'm starting to think I should have done.

The plan was to add a 4th coat, cross my fingers for no stains and then lacquer the floor.

Any help appreciated!

 

[footprints]

Might be resin or any old spillage, I would give the areas a couple of coats of Zinsser BIN that should hold it back.

 

[Robbie uk]

Im presuming the stain you are using is water based, this will not stop any stains coming through. An oil based primer / sealer will be needed first.