Most people picture sealant as a white line around the bath. But sealant comes in many colours, and the right one can make a joint almost disappear. The wrong one can draw the eye to every bead. This guide covers the main options for bathrooms, kitchens and windows, how colour matching works and what each finish is like to live with.
White
White is the standard for white baths, trays and basins against white or light tiles. It looks clean and crisp when new. Its downside is that mould and dirt show up clearly on it. That can be a good thing, as you spot problems early, but it means white beads need regular cleaning to keep looking their best.
Clear
Clear sealant lets the colour behind it show through. It can work well on glass, such as shower screens, and on surfaces with a pattern. But clear is not invisible. Anything inside the joint, such as dirt, old residue or mould, shows through the bead. It can also look cloudy or milky in some light. Clear is best where the joint behind it is clean and neat.
Grey, black and other colours
Grey sealants are popular in modern bathrooms with grey grout, as the bead blends into the grout lines. Anthracite and black suit dark tiles and dark worktops. Browns, creams and other shades are used on wooden or stone-effect worktops and on coloured window frames.
On windows and doors, the sealant is usually matched to the frame: white for white uPVC, and darker colours for anthracite grey, brown, black or coloured frames. Our window and door mastic service covers frames in a range of colours.
Need it done properly? Mr Mastic covers the South East, London and Scotland, with a one-year guarantee on every job. Call or email for a quick quote.
How colour matching works
Colour matching means picking the closest standard colour from the manufacturer’s range. It is rarely an exact match, because tiles, worktops and frames vary. In practice:
- Match to the surface the bead sits closest to, often the grout or the frame.
- Look at samples in the room’s own light, not just on a screen.
- Where two very different colours meet, choose the one that makes the joint least noticeable.
At a kitchen in Harper Drive, Maidenbower, we used a colour-matched sanitary silicone along the worktop so the new joint blended in.
Practical points
- Anti-fungal additives are available in many colours, not just white.
- Silicone can’t be painted, so choose the colour you want at the start. If a joint needs painting, it may need a different product. See caulk vs silicone.
- Dark colours show limescale and soap residue in hard water areas, so they need wiping down.
- Colour won’t hide a bad bead. An uneven or smeared joint looks wrong in any colour.
When you book a reseal, tell us the colours of your tiles, grout and worktops, or send photos, so we can suggest a colour.
Matching new sealant to old
If only part of a room is being resealed, the new sealant may not match the old exactly. White sealant can yellow or dull over the years, and coloured sealant can fade. Where joints are close together, such as the bath and the basin in the same room, it often looks better to reseal both at once so the colours match.
On windows, the same applies around a single frame. A new section of mastic next to old, weathered mastic can stand out. Resealing the whole frame gives a consistent finish.
Quick answers
Will coloured sealant fade?
Good-quality sealant is made to hold its colour, but sunlight, cleaning products and wear can change any finish over time.
Is clear sealant a good choice for a bath?
Sometimes, but it shows anything behind it. White or a matched colour often looks neater on a bath.
Can you match my grout colour?
We can choose the closest colour from the range available. An exact match is not always possible.
Related services
More advice
- Sealing Kitchen Worktops, Sinks and Upstands
- Regrouting or Resealing: Which Do You Need?
- Decorator’s Caulk vs Silicone: Which and Where
- All advice
This guide is general information about sealant work. It isn’t legal, fire-safety or structural advice; for those, speak to a qualified professional.