Type 1 Mastic


TEC® Skill Set™ Type 1 Mastic is a premixed, acrylic-based, multi-purpose tile adhesive designed for the interior installation of ceramic, stone or marble tile over selected wall, floor and countertop applications. Meets ANSI A136.1 Type l & ll. Spreads easily, sets quickly and is easy to clean up.

  • Tile up to 12 in. x 12 in. on walls, 8 in. x 8 in. on floors
  • Mold, mildew and water resistant
  • Non-slip
  • Creamy and easy to apply
  • May contribute to LEED® certification project points
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TEC® Skill Set™ Type 1 Mastic Product Info


TEC Skill Set Type 1 Mastic ready to use floor and wall adhesive can be used for installing ceramic, porcelain, natural stone, quarry and mosaic tile on interior floors and walls. Recommended for floor applications with tile up to 8 in. x 8 in. and wall applications with tile up to 12 in. x 12 in. It meets ANSI A136.1 Type I and II specifications, spreads easily, sets quickly, and is easy to clean up.


Key Benefits and Features

  • Creamy and easy to apply
  • Ready to use
  • Non-slip
  • Water resistant



1 quart (946 ml) plastic pail Product #70-4737-5121
1 gallon (3.78 L) plastic pail Product #70-4737-5021
3.5 gallon (13.25 L) plastic pail Product #70-4737-1221


Coverage will vary with type of substrate. Coverages below are approximations. Do not exceed trowel recommendations.


Approximate Coverage
Trowel 3/16 in. x 5/32 in.
“V” Notch
1/4 in. x 1/4 in. x 1/4 in.
Square Notch
Tile Size Up to 6 in. x 6 in. Walls: 6 in. x 6 in. to
12 in. x 12 in.
Floors: 6 in. x 6 in. to
8 in. x 8 in.
per 1 quart 6-8 sq. ft. (0.6-0.7 m2) 4-5 sq. ft. (0.4-0.5 m2)
per 1 gallon 27-32 sq. ft. (2.5-3.0 m2) 18-23 sq. ft. (1.7-2.1 m2)
per 3.5 gallon 95-112 sq. ft. (8.8-10.4 m2) 63-81 sq. ft. (5.9-7.5 m2)


Suitable Substrates
Concrete (well cured; on, above or below grade), masonry, gypsum wallboard (walls and dry areas only); cementitious backer units (CBU), coated glass mat backer board, water resistant gypsum wallboard, cured portland cement plaster, exterior grade plywood; APA Grade Trademarked Exposure 1 or better, minimum two 5/8 in. (16 mm) layers, joists 16 in. (41 cm) on center, installed in accordance with TCNA Installation Detail F 142, existing ceramic or resilient tile; plastic laminate.


Store in a cool, dry location.


Shelf Life
Maximum of 1 year from date of manufacture in unopened package­. Bucket good for 6 months after opening. (Re-seal and store in cool, dry location, use within shelf life. Covering with plastic wrap directly on top of product prior to sealing container will help to preserve freshness.)


Do not use with PVC heating mats or coils, polyethylene membranes or other membranes. Do not use on shower floors or pans, saunas, in steam showers, swimming pools, or any place that will receive standing water. Do not use for leveling or in excess of trowel recommendations. Not for use under most backer boards. Not for exterior use. Not for use where temperature will exceed 120°F (49°C). Do not use with resin or epoxy backed marble or with green marble. Not for use with ceramic accessories. Do not use over lauan or particle board. Not for use with lug backed floor tile. May discolor certain marble and granite, test in an inconspicuous area prior to use. The use of TEC Skill Set Marble Mortar is recommended for green marble and moisture sensitive stones.


FIRST AID MEASURES: In all cases, seek medical attention if symptoms develop or persist. EYES: Flush with water for 20 minutes. SKIN: Wash with soap and water. IF VAPORS INHALED: Remove to fresh air. IF SWALLOWED: Do not induce vomiting. WARNING! This product contains chemicals known to the State of California to cause cancer, birth defects or reproductive harm. KEEP OUT OF REACH OF CHILDREN. For Medical Emergency Information, call 1-888-853-1758.


This Product Data Sheet has been prepared in good faith on the basis of information available at the time of publication. It is intended to provide users with information about and guidelines for the proper use and application of the covered TEC Skill Set brand product(s) under normal environmental and working conditions. Because each project is different, H.B. Fuller Construction Products Inc. cannot be responsible for the consequences of variations in such conditions, or for unforeseen conditions.

Applicable Standard
Meets ANSI A136.1 Type I & II Specifications.

TEC Skill Set Type 1 Masstic
Description ANSI Requirement Typical Results
Shear Strength    
28 Day, Room Temperature > 50 psi (0.34 MPa) Passes
Type I Water Immersion > 50 psi (0.34 MPa) Passes
After Accelerated Heat Aging > 75% dry shear strength retention Passes
Heat Resistance Maintains at least 10 lb. (4.5 kg) static load
in shear at 120°F (49°C) for 24 hours
Impact Test All tiles remain bonded after impact Passes
Stain Test < 70% penetration Passes
Stability in Storage 4 weeks minimum Passes
Resistance to Mold Growth No mold growth Passes


Tested in accordance with American National Standards for Organic Adhesives for Installation of Ceramic Tile-ANSI A136.1, Type I


Physical Properties

Base Acrylic Latex
Physical State Paste
Color White
Odor Nil
Open Time [at 72°F (22°C)] 20 to 35 minutes
Wt./U.S. Gallon 12.5 lbs. ± .2 lbs.
VOC/Liter of Material 6 grams (calculated); 8 grams less water
Foot Traffic Rating (ASTM C627) Residential to light commercial

Surface Preparation
All surfaces must be clean, dry, free of dirt, dust, grease, oil, loose paint, wallpaper, and residues of old adhesive, or any foreign matter which might impair adhesion where TEC® Skill Set™ Type 1 Mastic is spread. Painted enameled walls and floors must be thoroughly scored or sanded to insure a bond to the original base wall or floor. Do not sand any floors or adhesives that are known or suspected to contain asbestos. Installations where concrete is damp or the concrete is subject to moisture vapor emissions can fail.


The adhesive, tile, and room should be maintained at a minimum temperature of 60°F for 24 hours prior to installation. The minimum 60°F temperature must be maintained during the entire installation, and for a minimum of 48 hours following.

Use a 3/16 in. x 5/32 in. V-notched trowel for installation of tile up to 6 in. x 6 in. For tiles larger than 6 in. x 6 in., use a 1/4 in. x 1/4 in. x 1/4 in. square-notched trowel. Maximum tile size: for walls is 12 in. x 12 in.; for floors is 8 in. x 8 in.

Only apply the amount of adhesive to surface that can be tiled over in 15 minutes. DO NOT SET TILE IF SKIN HAS FORMED ON THE ADHESIVE. If adhesive skin has formed, remove and re-apply. This time will vary with the temperature, humidity, and the substrate. Apply the adhesive to the substrate first with the flat side of the trowel. Then comb with the notched side of the trowel in one direction. Firmly press tiles into the adhesive and move them perpendicularly across the ridges. Do not slide tiles against each other. Periodically remove and check a tile to assure complete coverage.


Drying Time
Cure times will vary with size and porosity of tile and porosity of substrate (porcelain tiles take considerably longer to cure), humidity and temperature (cooler temperatures will extend set times). No traffic is permitted on tiles prior to curing. Grouting may begin once adhesive is firmly set up. Up to 6 in. x 6 in. wall tiles require wait time of 6 hours or longer. Over 6 in. x 6 in. tile or any floor tile application requires at least 24-48 hours. Check to determine readiness by trying to twist the tile and see if it moves. If it does, additional cure time is required. If the tile won't twist but you hear a wet suction sound when the tile is stepped on, additional cure time is also required. The use of TEC Skill Set brand grouts is highly recommended.

Full cure takes at least 48-72 hours depending on conditions.

For glass tile, refer to TEC Skill Set Glass Tile Mortar. For marble and granite installations, test in an inconspicuous area as discoloration may occur. Most discoloration disappears after 30 days. For proper curing, do not abut marble tiles together.


While adhesive is still fresh, clean tools, hands, and excess materials

Technical assistance

Information is available by calling the Technical Service Helpline.

Toll Free: 800-832-9023

TEC® Skill Set™ Type 1 Mastic Safety Data Sheet


TEC® Skill Set™ Type 1 Mastic Product Info

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