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Can you give me some advice on how to put a ready-made plaster in a honeycomb roller on an outside wall of agglos. It is a wall that is on the roadside that serves as a fence.

A rough agglos wall is not designed to directly receive a plaster, it must be previously coated (see our sheet Making a mortar of cement mortar).
On the bottom, the choice of a structured plaster roadside does not seem to be the most suitable solution. The pollution generated by road traffic, splashing water... will quickly foul the wall. A smooth finish seems far better. Apart from these restrictions, application to the honeycomb roll does not pose any particular problem. Nevertheless, a "knack" is necessary to hope to obtain a certain regularity along the entire length of the wall.

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