Blast away the rust and restore shine with the SmartSeal Rust Remover. This rust remover is an incredibly effective solution for dissolving stubborn rust stains that are caused by iron-containing fertilizers, metal garden furniture, and leaking heating systems on natural stone and concrete surfaces. This versatile product can be used both externally on patios, driveways, and walls, as well as internally if necessary. To use it, simply apply it generously to a dry surface and work it in with a brush. The fast-acting formulation will start to work straight away after application as it begins to attack and neutralize any rust stains present. Within minutes, the powerful chemical formula creates a purple-coloured reaction where the rust stains are so that you can see the rust remover working its magic. The formulation is pH-neutral and will not damage the natural stone or concrete after application. After brushing it on, simply wash it off to reveal a clean and rust-free surface. It is important to note that a purple discolouration shows the start of the reaction, and you should allow it to work for about five to ten minutes maximum. Do not let it dry on the surface. After the working time, rinse it off with plenty of water. If necessary, you may repeat the procedure. Keep in mind that some stones and concrete may change colour after treatment.