HMK® R777 is a ready to use special product that specifically removes rust spots and stains from all acid tolerant dense stone. Special additives reduce the development of rust after treatment. Do not apply in direct sunlight. Acid-sensitive surfaces such as polished and honed marble, limestone, agglomerates and concrete products, plastics and certain metal surfaces can be damaged by contact with HMK® R777. For interior and exterior use.
Do not wet surface before being treated. HMK® R777 can darken the stone if allowed to dry on the surface, although this may be reversed over time.
Protect all adjacent surfaces. If under-floor heating exists, switch it off and allow the surface to cool to room temperature. Apply undiluted HMK® R777 generously and evenly and work into the surface using a scrubbing brush, stiff brush or a suitable pad. Always apply to the whole surface. Place towels soaked with R777 onto the surface to keep the surface wet and to ensure that the treatment does not dry out. Immediately after application, cover the surface with plastic and let sit for 12 hours. Remove any remaining product on the surface after 12 hours and clean the area thoroughly using HMK® R155 Intensive Cleaner -acid free- diluted with clean water about 1:10 and remove the dirty liquid. Afterwards, rinse the area thoroughly with clean water.
Note: Using R777 on soft stones (marble, limestone, etc.) will damage the surface and/or the polished finish. During the 12 hour treatment period, it may be necessary to apply another coat of HMK® R777. In the case of very heavy rust stains repeat the procedure.
Chemical product. Contains phosphoric acid. Corrosive. Avoid eye/skin contact. If exposed, wash/ flush with water and seek medical attention. Take appropriate safety precautions when dealing with corrosives. At all times wear suitable protective clothing (gloves, masks, boots, etc.). Keep out of the reach of children.. Do not use the product in temperatures below 10 and above 27°C.
Always test the product in an inconspicuous area to evaluate suitability, coverage and performance. Store in cool place. Keep lid tightly closed.