Repair of fine cracks in Weber monocouche renders. Video demonstrates how to repair dormant cracks with no risk of further movement in a weber.pral monocouche render. Instructions are for cracks caused by drying shrinkage on new construction (normally within the first year) Please note… Straight line cracking is not typical of render failure, but rather of the reflection in the render of a crack in the substrate. The cause should be investigated prior to repair in order to ascertain the likely event of any further movement or whether remedial works are required. This assessment should be undertaken by a structural engineer.