Sure Klean® Weather Seal Natural Stone Treatment WB Water Repellent
Specifier Note: The information provided below is intended to guide the Architect in developing
specifications for products manufactured by PROSOCO, Inc. and should not be viewed as a
complete source of information about the product(s). The Architect should always refer to the
Product Data Sheet and MSDS for additional recommendations and for safety information.
Specifier Note: Paragraph below is for PART 1 GENERAL, Quality Assurance.
Test a minimum 4 ft. by 4 ft. area on each type of masonry. Use the manufacturer’s application
instructions. Let test area protective treatment cure before inspection. Keep test panels available
for comparison throughout the protective treatment project.
Specifier Note: Paragraphs below are for PART 2 PRODUCTS, Manufacturers and Products.
Manufacturer: PROSOCO, Inc., 3741 Greenway Circle, Lawrence, KS 66046. Phone: (800)
255-4255; Fax: (785) 830-9797. E-mail: CustomerCare@prosoco.com
Sure Klean Weather Seal Natural Stone Treatment WB is an odorless, water-based solution of
potassium methyl siliconate developed to effectively treat a wide range of natural stone
and masonry surfaces. Natural Stone Treatment WB is a low VOC treatment that provides long-
lasting repellency without altering the natural appearance of the substrate.
Natural Stone Treatment WB is used as a surface treatment on natural stone and masonry
surfaces to impart a water-repellent surface and reduce water absorption into the substrate.
Unlike conventional siliconate water repellents, Natural Stone Treatment WB has been developed
to help prevent surface staining during application.
FORM: Clear liquid, low odor
SPECIFIC GRAVITY: 1.02
WT./GAL.: 8.50 pounds
ACTIVE CONTENT: 3%
TOTAL SOLIDS: 4.5% ASTM D 5095
FLASH POINT: >212 degrees F (>100 degrees C)
FREEZE POINT: 32 degrees F (0 degree C)
SHELF LIFE: 2 years in tightly sealed, unopened container
VOC CONTENT: <5 g/L, Low Solids Coating. Complies with all known national, state and district
AIM VOC regulations.
May damage glass or be difficult to remove. Always protect.
Surface and air temperatures should be above 40 degrees F and below 85 degrees F.
Application should be avoided on extremely windy days to avoid rapid evaporation of the
Not recommended for dark, dense substrates.
Not recommended for polished or glazed surfaces.
Specifier Note: Paragraphs below are for PART 3 EXECUTION, Installation.
Before applying, read “Preparation” and “Safety Information” sections in the Manufacturer’s
Product Data Sheet for Weather Seal Natural Stone Treatment WB. Refer to the Product Data
Sheet for additional information about application of Weather Seal Natural Stone Treatment WB.
Do not dilute or alter.
1. Using low-pressure (<50 psi) spray equipment, apply Natural Stone Treatment WB in a
thin single saturating coat to a thoroughly dry surface.
2. When spraying, saturate from the bottom up. Use enough to create a 4" to 6" rundown
below the spray contact point.
Brush: Minimize overlap. Saturate the surface. Brush out heavy runs and drips that do
Porous Surfaces: Let the first application penetrate the masonry surface. Re-saturate
within 5 to 10 minutes. Less material will be required on the second application.
Dense Surfaces: Saturate in a single application with no rundown. Back roll any runs or
drops to ensure uniform appearance. One application is usually enough.
Horizontal Application Instructions
1. Apply a single, saturating coat so that the surface stays wet for a few minutes.
2. Thoroughly broom out any pools or puddles that do not completely penetrate the
surface. Do not let puddles stay on surface.
Drying Time: Protect treated surfaces from rain and pedestrian traffic for 4 to 6 hours after
Cleanup: clean equipment and over spray with soap and warm water.