Removing Silicone Caulking Stains From Marble
REMOVING SILICONE CAULKING STAINS FROM MARBLE
THE CLEANING OR REMOVAL OF STAINS FROM STONE MAY INVOLVE THE USE OF
LIQUIDS, DETERGENTS OR SOLVENTS WHICH MAY RUN OFF ON ADJACENT
MATERIAL, DISCOLOR THE STONE OR DRIVE THE STAINS DEEPER INTO POROUS
STONES. USE THE PRODUCTS AND TECHNIQUES DESCRIBED HERE ONLY FOR
THE COMBINATIONS OF DIRT/STAIN AND STONE SPECIFIED.
A. This procedure includes guidance on removing silicone
caulking residue from marble surfaces.
B. Silicone caulking is sometimes used (inappropriately) to
help hold the anchors in place that secure the stone
panels. Often, the silicone will eventually bleed
through the stone at the location of the anchor holes and
deposit on the surface, leaving a film that is difficult
C. See 01100-07-S for general project guidelines to be
reviewed along with this procedure. These guidelines
cover the following sections:
1. Safety Precautions
2. Historic Structures Precautions
4. Quality Assurance
5. Delivery, Storage and Handling
6. Project/Site Conditions
7. Sequencing and Scheduling
8. General Protection (Surface and Surrounding)
These guidelines should be reviewed prior to performing
this procedure and should be followed, when applicable,
along with recommendations from the Regional Historic
Preservation Officer (RHPO).
D. For additional information on poulticing, see 04455-02-R.
E. For general information on the characteristics, uses and
problems associated with marble, see 04455-01-S.
A. Prosoco, Inc.
NOTE: Chemical products are sometimes sold under a common
name. This usually means that the substance is not as pure as
the same chemical sold under its chemical name. The grade of
purity of common name substances, however, is usually adequate
for stain removal work, and these products should be purchased
when available, as they tend to be less expensive. Common
names are indicated below by an asterisk (*).
A. Methylene Chloride:
NOTE: THIS CHEMICAL IS BANNED IN SOME STATES SUCH AS
CALIFORNIA. REGULATORY INFORMATION AS WELL AS
ALTERNATIVE OR EQUIVALENT CHEMICALS MAY BE REQUESTED FROM
THE ENVIRONMENTAL PROTECTION AGENCY (EPA) REGIONAL OFFICE
AND/OR THE STATE OFFICE OF ENVIRONMENTAL QUALITY.
1. Other chemical or common names include
Dichloromethane; Methylene bichloride; Methylene
2. Potential Hazards: TOXIC.
3. Available from chemical supply house, dry cleaning
supply distributor, paint store, photographic
supply distributor (not camera shop), or printer's
4. White absorbent material (molding plaster, untreated
white flour, white tissue, paper towels, powdered chalk,
talc, fullers earth or laundry whiting)
5. Mineral water
6. Plastic sheeting
7. Clean dry towels for blotting the area after treatment
B. Alternative Products:
Prosoco Dicone NC9 or Prosoco Dicone NC 15 Gel; follow the manufacturer's instructions when using these products.
A. Glass or ceramic container for mixing the solution
B. Wooden utensil for stirring the ingredients
C. Wood or plastic spatula
D. Masking tape
A. Examine the marble surface CAREFULLY to determine the
cause of staining before proceeding with any cleaning
3.02 ERECTION, INSTALLATION, APPLICATION
NOTE: TEST CLEAN A SMALL AREA BEFORE ATTEMPTING TO CLEAN
A. Rinse the area to be treated with mineral water.
B. Thoroughly moisten the stained surface with the solvent.
Be sure to dampen well beyond the stain.
C. Mix the remaining liquid with the white absorbent
material to form a paste the consistency of oatmeal or
cake icing. (Approximately one pound of paste is needed
for every square foot of surface area to be treated.)
D. Using a wooden or plastic spatula, apply the paste to the
stained surface in layers no more than 1/4 inch thick.
The poultice should extend well beyond the stain to
prevent forcing the stain into previously clean stone.
E. Check the coating for air pockets or voids.
F. Cover the poultice with plastic sheeting and seal with
G. Let set for 48 hours (unless otherwise specified).
H. After set period, dampen the poultice with mineral water.
I. Remove the poultice with a wooden or plastic spatula to
avoid scratching the surface.
J. Again, thoroughly rinse the cleaned area with mineral
water, blot with clean towels and allow the surface to
K. Once the surface has dried completely, check for
remaining residue and repeat the treatment if necessary.
Many applications may be required.
END OF SECTION