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https://www.thepavingexperts.co.uk/product/larsen-professional-slc-2500/
Larsen SLC 2500 is a rapid set, hand or pump applied cement based levelling topping, specially designed to eliminate surface irregularities and smooth both internal and external concrete surfaces which are exposed to industrial traffic. SLC can be applied from 5-15mm, or for isolated thickness up to 50mm you can mix 25KG SLC 2500 with 12.5KG of clean, dry 3-6mm aggregate.
How thick and in what location?