Composite kitchen sinks — made from a blend of granite or quartz particles bound in acrylic resin — have become increasingly popular in UK kitchens over the past 15 years. Brands like Franke, Blanco, Schock and Reginox are common, and composite sinks are appreciated for their appearance, heat resistance and the way they integrate aesthetically with stone and composite worktops. But composite sinks can chip, scratch and stain — and this guide covers what’s repairable.
Chip Repair in Composite Sinks
Chips in composite sinks typically occur at the rim, at the base of the sink bowl, and at the front edge — from dropped pots, glasses and kitchen equipment. Composite chip repair:
- Colour-matched repair compound is selected or mixed to match the specific composite colour (Franke Fragranite, Blanco Silgranit and similar composites come in a range of colours from white through anthracite and black)
- Filler is applied and built up to the surface level of the surrounding sink
- Once cured, the repair is sanded and polished to match the texture and sheen of the composite surface
- Matching the matt, slightly granular texture of composite surfaces is the key skill — composite repair is noticeably more visible in a uniform colour dark sink than in a lighter or more textured finish
Scratch Removal on Composite Sinks
Fine scratches in composite sinks — from cutlery, cleaning pads and daily use — can often be addressed using composite sink cleaning and restoration kits that polish out light surface scratches. Deeper scratches that have removed composite material require the same filler approach as chip repair.
Stain Removal from Composite Sinks
Composite sinks can stain from limescale (particularly in hard water areas), tea, coffee, rust and mineral deposits. Treatment:
- Limescale — descaling products appropriate for composite (not highly acidic products that can damage the resin binder) applied and left to work
- Tea and coffee staining — proprietary composite sink cleaners or a paste of baking soda applied and scrubbed gently; for stubborn staining, a composite-safe bleach treatment
- Rust staining — from metal items left in the sink; removed with rust-specific treatment products
