ProBlock – Pre Sealer

ProBlock Key Features

  • Ideal for six sided pre sealing (dip sealing)
  • Allows moisture vapor transmission
  • Works excellent as a grout release
  • Is not an adhesive bond breaker
  • Safe to use, water-based, low VOC

For Use On

As a pre sealer or grout release for all natural stone such as granite, basalt, marble, limestone, sandstone, bluestone, travertine, slate etc. concrete pavers, brick and masonry. For interior and exterior use.

Aqua Mix® ProBlock – Pre Sealer for porous stone & tile is an economicalnatural look, breathable sealer. It is a water based penetrating pre sealer designed to resist staining caused by water soluble minerals (including picture framing effect) which are normally absorbed through the back of the stone during installation. It also helps resist efflorescence migration. ProBlock is not an adhesive bond breaker.


  • Not for use as a final top surface sealer
  • Do not allow sealer to come in contact with any non-recommended surface
  • If product is allowed to dry on surface, a white film may form. If this occurs, scrub with water and a white nylon pad
  • ProBlock is not a waterproofing agent
  • Not for use on the top surface prior to the application of Enhancing Sealers such as Aqua Mix® Enrich’N’Seal™ or Aqua Mix® Stone Enhancer 

Application of Product

Read entire label before using. All surfaces should be clean, dry and free of existing sealers or coatings. Dust off, wipe or brush all surfaces to be sealed to remove all loose particles that could adversely affect sealer penetration and performance. The Stone or Tile must be dry prior to applying sealer – the following document explains in detail the definition of the term “dry” as it relates to sealer application. READ MORE A single coat is recommended, assuring 100% coverage. For use as a pre-seal prior to grouting apply a single coat to the top surface, and sides if required. Sealing all six sides is recommended for maximum protection. If applying an enhancer as the final surface seal, DO NOT apply any ProBlock to the top surface as it will stop the penetration of enhancing sealers. Please contact Aqua Mix® prior to installation if an enhancer is specified for use. Be sure any sealer that does not penetrate surface is polished DRY off the surface within 5 minutes of application using absorbent paper or cotton towels.

Cleaning of equipment

Clean applicator tools immediately with water after each use.

Drying Time:

  • Sealer should be allowed to cure 48 hours prior to installation.
  • When used as a pre-sealer, sealer must cure a minimum of 2 hours prior to grouting.
  • Ensure good airflow during the curing process.
  • Do NOT allow to get wet during the curing process.


TREAT THE SEALED UNDERSIDE SURFACE AS A LOW POROSITY DENSE SURFACE. ProBlock will reduce the porosity of the underside sealed surface. Please contact your adhesive supplier for specification of the appropriate adhesive suitable for installing low porosity dense surfaces. Sealed underside surface and substrate should be thoroughly wet out with the adhesive (using the flat side of trowel) prior to applying adhesive with appropriate notch trowel to ensure proper coverage and adhesion. Follow adhesive manufacturer recommendation for the appropriate adhesive.

How to Pre Seal Stone on all Six Sides (Dip Seal)

How to Pre Seal Natural Stone

Technical Article

Why Seal all Six Sides?  Benefits of Sealing all Six Sides Six Sided Sealing with Adhesion

Case Study

Dubai Airport


Approximately 4 m2 – 14 m2, per litre, per coat when applied to all 6 sides, depending on type of surface porosity, surface temperature, humidity and method of application.

VOC Content

Maximum VOCs: <5 grams per liter

Available In

3.8L & 19L

Product Warranty

Custom® Building Products warrants to the original consumer purchaser that its product shall be free from defects in material and workmanship under normal and proper usage for a period of one year following the date of original purchase. CUSTOM’s sole liability under this warranty shall be limited to the replacement of the product. Some states, countries or territories do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty will not extend to any product which has been modified in any way or which has not been used in accordance with CUSTOM’s printed instructions. CUSTOM makes no other warranties either expressed or implied. This warranty gives you specific legal rights, and you may have other rights that vary from state to state or from one country/territory to another. This warranty is not transferrable.

Require Technical Assistance?

Please contact us at 1300 AQUA MIX or