Metal trowel complete, wherever a traditional hand or device trowelled finish is used for the surface of the slab, normally with a transparent sealer applied, preferably a minimal unstable organic and natural compound sealer Void formers are expanded foam packing containers that insulate the slab, but floor-coupled alternatives are available. https://knoxirvvl.ageeksblog.com/35782191/engineered-concrete-specialists-delivering-durable-results-across-new-zealand