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All surfaces must be thoroughly cleaned andprepared. All loose particles, laitance, dust,curing compounds, floor hardeners, oil, grease,fat, bitumen and paint must be removed if goodbond strength is to be achieved. Gloss surfacesmust be abraded.If oil, grease, fat, etc. are present, they should beremoved before starting any other form ofpreparation. All laitance weak or friable concreteshould be removed by chipping, grit blasting, orscrabbling until a sound base is obtained.All laitance should be removed by mechanicalscarification, grit blasting, or by acid etching.Visible signs of mould growth, lichen, or algae,should be removed and treated with a fungicidalwash.New concrete should have cured until theshrinkage and moisture movement is low.Surfaces heavily impregnated with mould oilshould be decreased and grit blasted ormechanically scarified to remove thecontaminated surface. All curing compoundsshould have disintegrated or be removed andapplication carried out only onto a clean, dust freesurface.