HMK® R77 Rust Remover For Natural Stone, Bluestone, Flagstone, and all Masonry and Brick Surfaces
A heavy duty, dilute acid type cleaner for all rough/textured, and honed stone and masonry surfaces, both interior and exterior. HMK® R77 dissolves and removes rust, delaying, in most cases preventing, it's reformation. 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) R77 can darken stone (polished granite especially). It is recommended entire area be cleaned first with HMK® R55 Intensive Cleaner to pre-treat area, removing dirt, waxes, coatings, and other organic matter that may interfere with the R77 Rust Remover. Then neutralize the acid cleaner and thoroughly rinsed with water. Avoid contact with metal; acid/fumes may cause etching. Allow to dry completely before using R77.
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
DIRECTIONS: See Manufacturers Website Instructions HERE
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.
Note: During acting time protect from water. However, Keep surface wet with R77. Do not let R77 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 (1-part to 6-parts 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.