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My driveway is rather mossy and porous and 30Sq M.
What quantity and type of restorer do I require,please?
You will need to jet wash off all the moss, then once it is clean and dry you can use the Tarmac restorer (link below).
The biggest issue with tarmac is that UV causes the bitumen to degrade which results in the colour fading and the stones becoming loose, our Tarmac restorer recolours, binds and contains UV filters to ensure you tarmac looks good for years.