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When making a mosaic, you may choose not to grout a section of it. Some materials can't be grouted or look better not grouted. Porous materials, in particular, can't be grouted as they will take up the colour of the grout. Materials that can't be grouted include unsealed ceramic tiles and natural pebbles.
To protect your materials, you can use the following technique:
- Carefully cover the materials you wish to protect with masking tape or blue tack. I use masking tape, cut it to size, and gently press it onto the item.
- Apply the grout to your mosaic, being extra careful on the areas you have covered
- Allow the grout to dry for about 30 minutes, and gently remove the masking tape or blue tack.
- If the area needs a quick clean-up, get a sharp tool and gently neaten it.
