PROFLEX® PRO-STICK 42 thin set mortar has superior performance and workability characteristics not found in regular thin set mortars, along with an extended open time. When mixed, it produces a creamy, easy to spread mortar specially developed for the professional tile setter. For commercial and residential use.


  • ANSI A118.11 compliant
  • Extended open and working time
  • High strength for a variety of applications


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.

Shear Strength 7 days (psi)28 days (psi)
Quarry Tile250-300450-500
Mosaic Tile250-300300-350
Glazed Wall Tile 250-300400-450
Quarry Tile to Plywood175-200200-250
Compressive Strength1500-20003500-4000
Adjustability15-20 minutes
Open Time50-70 minutes
Final Set6-8 hours

Recommended Trowel Sizes

1/2” x 1/2” x 1/2” square notch trowel 40-50 sq. ft. , 1/4” x 3/8” x 1/4” square notch trowel 70-80 sq. ft.

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)