The Viafix product made the perfect finish to a DIY repair I made to a collapsed yard drain in the center of my driveway. Viafix worked easily into the 5cm hole directly from the tub and bonded really well with the concrete substrate in damp conditions. It was easy to level off to the match the contours of the drain edge. The aerosol Via sealant allowed me to get a very neat edge on the joint with existing tarmacadam which I cut with a broad chisel and the metal drain surround.