London Waste is the largest waste to energy plant in the UK. The sites residual ash conveyor transports incinerated waste ash to a large magnet that separates ash from alloy. The residual ash conveyor has suffered accelerated corrosion to its carbon steel structure due to the nitrate content of the ash it transports. SPG have been contracted to wet blast the steel structure using a water and copper slag working mix and install a surface tolerant mastic aluminium (M922M). This project has a surface area of 1200 m2 and is being completed using powered access at a height of twelve meters. The project is due to be completed in August of this year.