Workshop Wall Mark

[pmb30]

Hello,

Wondered if anyone could help? Been painting on breeze block walls with B&Q White Emulsion. On painting one bit, looks as though in the past there has been an oil or fuel leak on the floor and some of the wall.

What can sort it? Is it as simple as keep painting over it and the mark will eventually disappear? Already had about 4 coats!

Thanks in advance

Peter

 

[Bosswhite]

Cover stain with oil based undercoat ,then emulsion paint.

 

[pmb30]

Cheers, will try that!