The Grout ink solution has been developed to restore your coloured grout caused by bacteria that is shaped especially in the shower cube-shaped and round bathtubs. Not only does this product restore the mortar look it also helps prevent further bacteria with its antibacterial preparation. Groutin 125 ml can cover up to 500 metres of joints. The formula is water-based and non-toxic. It has antibacterial and anti-fungal agents to prevent forms of return. The product is safe to use in enclosed spaces. The mortar paint becomes waterproof within 24 hours. Suitable for all types of wall and floor joints. Recommended use is with a brush.