We are migrating our StoneCareOnline store to a new platform. Please order the Rust Removing Combo for Hard Stone HERE
HMK® R777 (R77) Rust Remover and HMK® R155 (R55) Commercial Grade Intensive Stone Cleaner Combo Pack
Clean Rust on Natural Stone, Bluestone, Flagstone, Granite, and Brick Surfaces
Included: 1-liter R77 Rust Remover AND 1-liter R55 Intensive Cleaner
R777 is a heavy duty, dilute acid type cleaner for all rough/textured, and honed stone and masonry surfaces, both interior and exterior. HMK® R777 dissolves and removes rust, delaying in most cases, or preventing its reformation.
Perfect for Cleaning Bluestone pavers, walkways and patios. Bluestone and other natural stone has iron oxide crystals with the composition of the stone. When exposed to high humidity, rain, snow and irrigation, the moisture causes the iron oxide to seep out and turn Bluestone brown or may exhibit in pronounced rust spots. R77 works great to eliminate or greatly reduce rust spots in Blustone.
It is recommended that once rust is cleaned that the area be sealed with HMK S34 Silicone Impregnator to reduce moisture penetration and slow down rust formation.
HMK® S34 Silicone Impregnator is recommended to further prevent oxidation and rusting. Do not use on polished surfaces, with the exception of some polished granite (always test on an inconspicuous area before use) R777 can darken stone (polished granite especially). It is recommended entire area be cleaned first with HMK® R55 Intensive Cleaner to neutralize the acid cleaner and thoroughly rinsed with water. Avoid contact with metal; acid/fumes may cause etching.
Experts Suggestion: For old stone surfaces that have not been cleaned or sealed for years: Clean area with HMK R155 Intensive Cleaner to remove dirt, moss, and other residues to make R777 more effective. Clean, Scrub, rinse very well, allow to dry for 48 hours. You may want to test a diluted solution first to see if this is strong enough for your rust problem. My approach is to always start with a weak solution and graduate up to full strength. This may prevent stone from being damaged, or colored stones from being bleached out.
Protect all adjacent non-masonry surfaces. Do a manageable area at a time. Apply full strength and evenly to dry surface. Allow to act until rust disappears, this may require several hours. Apply directly to trouble spots first, allowing time to activate. For more instructions from manufacturer, please click HERE
Note: During acting time protect from water. However, Keep surface wet with R777. Do not let R777 dry on the surface, for it may cause discoloration. Repeated applications may be needed. Scrubbing may be helpful. When stains are removed rinse thoroughly. First rinse should be a flood rinse. Second rinse should be a neutralizing rinse using a solution of HMK® R55 Intensive Cleaner and water.
60-80 sqft., 5.5-7.5 square meters per 1 liter (34 oz.) container .
Chemical product. Contains Inhibited Dilute Phosphoric Acid. Corrosive. Avoid eye/skin contact. If exposed, wash/flush with water, and get medical attention. Follow appropriate safety precautions when dealing with corrosives. At all times wear protective gear (gloves, masks, boots, etc.). Keep out of reach of children. See Material Safety Data Sheet.
1 liter bottle (34 oz.)
Store in cool place. Keep lid tightly closed.
Always test procedure first in an inconspicuous area to determine dilution rate, performance, visual appearance, and acting time so as not to harm the stone, since HMK® R77 is highly acidic.
Limitation of liability: The liability of HMK® for defective products and any claims for damages whatsoever is limited to the purchase price of the products. HMK® shall not be liable for any consequential damages. No other warranty or representation is made or implied.