GST International Water Block

• Water Block will significantly reduce the negative effects of spalling and the formation of efflorescence.
• Effective both indoors and outdoors, Water Block may be used as a grout release on tile and masonry surfaces.
• This will prevent the potential staining that can occur from the cement grout intruding on the surface of the product being installed.

• Inhibits efflorescence
• Water-based, solvent free, low odor
• Indoor or outdoor application
• Invisible natural look protection
• Repels water, dirt and waterborne stains
• Mildew resistant
• Resists freeze/thaw spalling
• Waterproofs tile & shower grout
• Easily applied, fast drying, long lasting
• 3 - 5 % color densification

• Invisible
• Repels Water
• Repels Grease and Oil
• Resists Stains
• Resists Efflorescence
• Resists Spalling

High traffic areas will require periodic reapplication for optimum water repellency.

• Standard concrete
• Split-face block
• Concrete building block
• Concrete pavers
• Brick
• Mexican style pavers
• Terra-cotta tile
• Unglazed tile
• Stucco
• Flagstone
• Artificial stone
• Slate
• Quarry tiles

• Porous Surface: 100 - 200 sq.ft./gal (flagstone, Mexican clay tile, paver brick, etc.)
• Dense Concrete: 400 - 700 sq.ft./gal (slate, stone, limestone, etc.)
• For exact coverage rates, a measured quantity to proper saturation over a known area will provide a square foot coverage rate for a specific job.

• Clean Up (When Wet): .Water.
• Remove: Not removable

• Before use on a job, thoroughly test this product on a small area to assure performance and appearance.
• Use only in well ventilated areas. Immediately remove pools or puddles were over application has occurred.
• Cleaning your hardscape project with a pressure washer and/or a surface cleaner is the first step in preparing for a successful project.
• It is strongly recommended to utilize a heated pressure washer to aid in the cleaning process.
• A heated pressure washer in conjunction with Pro Grade Cleaner will remove most organic stains, weeds, and old polymeric sand in considerably less time than it would take with a cold water unit.
• A heated pressure washer will also aid in the removal of residual sealer and decrease the labor when ‘stripping’ old sealer off.
• Stringent cleaners such as muriatic acid can be very harmful to your pavement, causing irreversible damage to the surface.
• Most colorants for concrete are made from iron oxide (FeO2) or better known as rust.
• Strong acids like muriatic acid will dissolve these pigments permanently changing the appearance and etching the surface.
• Allow product to dry thoroughly before applying a sealer.

• The product is applied with our Low Volume Pump Sprayer.
• Applying sealer on perimeter edges with a roller is acceptable to eliminate overspray on vegetation and surrounding structures.
• Using the GST Low Volume Pump Sprayer, add sealer up to the top of the GST Logo printed on the sprayer.
• Pump the sprayer approximately 30 times to pressurize the tank. Hold the spray wand 8”-10” from the surface and begin to apply the sealer using an overlapping circular motion to ensure an even application.
• To maintain a consistent even flow of sealer, it will be necessary to continually pump up the sprayer as the pressure in the tank decreases.
• The surface will appear ‘wet-damp’ for 8-10 seconds.
• If you over-apply the sealer and create puddles, it will be necessary to stop spraying and disperse additional sealer on the surface with a blower.
• Back-rolling solvent-based sealers may leave application lines on the surface.
• On segmental pavement systems, application of any sealer with a roller is not recommended as it will pull sand from the joint and will deposit it on the surface causing an undesirable result.
• One coat will seal, protect and enhance the beauty of the surface.
• If a second coat is necessary due to extreme porosity, apply as soon as the first coat is dry to the touch.
• GST sprayers are made with solvent resistant tips and seals, however do not let the sealer dry on the spray tip.
• If this occurs, soak the tip in lacquer thinner. Replacement tips are available.
• Do not apply the product during inclement weather or in direct sunlight when temperatures exceed 80ºF.
• Application to a damp surface or uncured concrete (28 day minimum) may cause a hazy appearance or loss of adhesion.
• Air and surface temperature should be between 50ºF and 80ºF for 24 hours following application.

• Indoor applications
• Outdoor applications
• Porous Surfaces
• Dense Surfaces
• Concrete, Exposed Aggregate
• Pavers and Slabs
• Brick Masonry
• Natural Stone & Travertine
• Concrete Block Wall
• Manufactured Stone