PROFLEX™ PRO-STICK 42R (ANSI 118.11) is a rapid set thin set mortar is formulated to be a fast setting mortar with superior performance and workability characteristics. PRO-STICK 42R When mixed, has an initial setting time of 1 hour.  Specially developed for the professional tile installer.  For commercial and residential use.



For installation of: Ceramic tile, Pavers, Quarry tile, Porcelain tile, Clay bodied tile, High bottom lugged tile, Marble, Granite, Mosaic, large format tiles, Vertical tile installations up to 5 lbs per sq.ft For installation over: Tile backerboard, Plumb and true masonry, Properly cured and finished concrete, Gypsum plaster, gypsum block or gypsum board (dry areas – walls only,) Cured portland cement mortar, exterior grade plywood, plastic laminates, masonry surfaces.


  • Ready to mix product without the need for additives
  • High strength for a variety of bonding applications
  • 1 hour initial set
  • 2-4 hour foot traffic
  • ANSI A118.4, A118.11 compliant

Suitable Surfaces

  • Backer Boards
  • Plumb and True Masonry
  • Cured and Finished Concrete
  • Gypsum Wallboard (dry areas only)
  • Cured Portland Cement
  • Exterior Grade Plywood
  • Plastic Laminate
  • Masonry Surfaces
  • Proflex Membranes and Underlayments (see warranties)

Coverages, Packaging

  • 25 lb Bag
  • 1/2″ x 1/2″ x 1/2″ square notch trowel 20-25 sq.ft.
  • 1/4″ x 3/8″ x 1/4″ square notch trowel 35-40 sq.ft.

Data Sheets

Requires Adobe Reader Data Sheet/Installation Guidelines

Requires Adobe Reader Material Safety Data Sheet

Requires Adobe Reader Bronze 5 Year Warranty 

Requires Adobe Reader Silver 15 Year Warranty 

Requires Adobe Reader Gold Limited Lifetime Warranty 

Warranty based on the system of materials used to install finish flooring products.
Please refer to our full warranty information for specific terms and conditions.