DIY summer tip
Use a tile-sealer liquid (try QEP Tile Sealer, £12.98, B&Q), following the manufacturer’s instructions.
If you’re sealing riven slate (or something similar), which has a ‘grain’, apply the sealer in the direction of the grain.
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Hide AdUsing too much sealer can leave white marks, so be careful not to, but if you have applied the sealer with the grain, the marks will be less noticeable and you may not need to remove the sealer and start again.