Neutral-Cure Silicone for Stone — 310 ml

There are places on a wall where grout is the wrong answer: the corner where two walls meet, the line where the stone touches the bath, the skirting, the edge round a basin.

Those places move — the house settles, the temperature swings, the bath fills and empties. A hard joint there cracks within the first year. Silicone stays elastic and follows the movement.

It has to be neutral cure. Ordinary silicone releases acid as it sets, and flexible stone is mostly calcium carbonate — the same material as marble, which acid attacks. This one is neutral.