RapidCoat® Midweight

The midweight you depend on. Specifically designed for professional use, our midweight mud combines the workability you need for application with the durability you want for long-term performance.

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About

Continental Rapid Coat® Midweight Joint Compound is a professional-grade joint compound ideal for use in all phases of gypsum-board finishing: taping, finishing, skim coating, texturing, filling corner beads and trim, and concealing nail or screw dimples. 

Rapid Coat® Midweight Joint Compound also makes an excellent bonding agent for laminating gypsum wallboards together.

Physical Characteristics:

Material: Vinyl-type formulation; asbestos free.

Coverage: Approximately 8.3 gallons (31.4 liters) per 1,000 square feet (100 square meters); coverage will depend on number of beads and amount of trim.

Drying time: Thoroughly dry in approximately 24 hours. Drying times will vary with temperature and humidity (see GA-236).

Storage: Up to nine-month shelf life if protected from extreme heat and cold.

Available Sizes:
PAIL: 4.5 gallons/17 L
PAIL: 3.5 gallons/13.25 L
PAIL: 4.5 gallons/17 L

Color: White.

Standards and Codes: Rapid Coat® Midweight is manufactured to conform to ASTM C 475.

Advantages
  • Smooth and durable surface finish
  • Superior performance for all levels of finish (tape, bed, finish, texture)
  • Easier to sand than conventional all purpose joint compound
  • High durability and abrasion resistance
  • Strong bond and adhesion
  • Excellent workability, easy to spread
  • Designed specifically for professional use
  • Fast drying with low shrinkage
  • Superior performance through all finishing tools
  • Consistent color and perfect for texturing
Sustainability

Rapid Coat® Midweight Joint Compound can contribute to the U.S. Green Building Council's LEED Credit Qualification in several credit categories to assist in obtaining LEED certification. 

Application Instructions

Apply according to Gypsum Association publications GA-214 and GA-216.

Taping and Finishing Joints:
Step one: Using a taping knife (4 to 6 inches), generously apply Rapid Coat® Midweight joint compound to the surface you want to finish (tapered edge). Then, press joint tape firmly into the compound, removing any excess material behind the tape and creating a good bond with the gypsum board. Allow the compound to dry thoroughly.

Step two: Using a finishing knife, trowel or mechanical tool (8-10 in.), apply a fill coat of Rapid Coat® Midweight joint compound over the embedded tape. Remove excess material by feathering the center and the edges of the joint. Allow the compound to dry thoroughly.

Step three: Using a finishing knife, trowel or mechanical tool (10-12 in.), apply a thin coat of Rapid Coat® Midweight joint compound over the step-two application at a width adequate to fill any voids or shallow spots. Remove excess material by feathering the center and edges of the joint. Allow the compound to dry thoroughly before sanding or painting.

Finishing Inside Corners:
Using a steel finishing knife (4 to 6 inches), generously apply Continental Rapid Coat® Midweight joint compound to both sides of the inside corner. Fold the joint tape along the center crease and press firmly into the center of the inside corner. Remove any excess material behind the tape and create a good bond with the gypsum board. Allow the compound to dry thoroughly. Apply a second coat to one side, allow it to dry, and apply another coat to the opposite side. Allow the compound to dry thoroughly before sanding or painting.

Note: Rapid Coat® Midweight is not recommended for use with mesh tape. For mesh tapes, use Continental Rapid Joint® setting-type compounds.

Fasteners and Trim:
Rapid Coat® Midweight can be applied to fill corner beads and nail or screw dimples. A second coat, if needed, may be applied when the first has dried.

Sanding:
Sanding is not required between applications unless the work is rough. Sand lightly after Step Three application is completely dry. If dry-sanding, use minimum 150-grit sandpaper. Avoid over-sanding, which can scuff gypsum board paper.

Skim Coating:
Rapid Coat® Midweight can be used to skim coat gypsum-board walls. A skim coat leaves a thin film of joint compound over the entire gypsum-board surface, filling imperfections and eliminating textural differences between the gypsum board and the joint compound. Skim coating is recommended for rooms with critical lighting conditions.

Painting and Wallpapering:
Painting should not proceed until the joint compound is thoroughly dry (see GA-236). For best results, a good-quality gypsum-board primer should be applied, according to the primer manufacturer's instructions, before painting or wallpapering.

Texturing:
Rapid Coat® Midweight can also be used to texture walls and ceilings. For best results, a good-quality gypsum-board primer should be applied, according to the primer manufacturer's instructions, before texturing. Rapid Coat® Midweight can then be applied to the dry primer surface up to 1/4 inch thick with a roller, sponge, brush, or trowel to create the desired effect. Overpaint when dry in accordance with the manufacturer's instructions.

Cleanup:
Rapid Coat® Midweight washes off easily with warm water. Tools should be dried thoroughly to prevent rusting.

Product & Safety Precautions
  • Apply to clean and dry surfaces.
  • Protect from freezing, extreme heat, and direct sunlight.
  • Maintain a minimum working temperature of 55 degrees F (13 degrees C).
  • Do not mix the compound with any other product or material (such as chemical setting compounds or plaster of paris).
  • If separation exists, remix thoroughly, taking care not to introduce air bubbles.
  • If thinning is required, such as for machine applications, add water in small (4-ounce) increments. Excessive thinning of the product may cause cracking, increased shrinkage, or other undesirable results.
  • Allow the compound to dry thoroughly between coats and before painting.
  • Keep the compound container tightly closed between uses.
  • For finishing with mesh tape, use Continental Rapid Joint® setting-type compounds.
  • Wear safety glasses at all times to protect eyes.
  • Wear a NIOSH-approved respirator when sanding or engaging in other dust-producing activities. Exhaust ventilation may be required during dust-producing activities in areas with poor ventilation.

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