Ronseal One Coat Stain Block White Basecoat 400ml aerosol 750ml 2.5L
£13.61
It blocks just about anything, including crayon, red wine and dirt. (But for damp stains you’ll need Ronseals Damp Seal). Flexes with the wood, so it doesn't crack or peel. Use white for light colours and grey for darker colours.
