RapidCoat® Extra Lightweight

Continental Building Products Rapid Coat® Extra Lightweight is an all-purpose joint compound, ideal for use in all phases of gypsum board finishing: taping, finishing, skim coating, filling corner beads and trim, and concealing nail or screw dimples.


Continental Rapid Coat® Extra Lightweight is ideal for use in all steps in the drywall finishing process. From taping to concealing nail and screw dimples, our extra lightweight mud is quick and easy to use. 

Physical Characteristics:

Material: Vinyl-type formulation;

Emissions: Asbestos free. VOC (Volatile Organic Compound) content < 2 g/ L

Coverage: Approx. 7.75 Gal. (29.25 L) per 1,000 ft2 (100 m2) coverage will depend on number of beads and amount of trim.

Drying Time: Approx. 4 hours to harden; thoroughly dry in approx. 24 hours. Drying times will vary with temperature and humidity (See GA-236).

IMPORTANT: For interior use only. Maintain a minimum 55° F (13° C) working temperature during application and drying. For optimum drying, maintain room temperature between 68˚–77˚ F (20˚–25˚ C) and provide adequate ventilation.

Storage: Up to 9 months if protected from extreme heat and cold. Maintain storage temperature above 32˚ F (0˚ C).

Available Sizes:*

  • PAIL: 4.5 U.S. Gal./17 L
  • PAIL: 3.2 U.S. Gal./12 L
  • PAIL: 1.1 U.S. Gal./4 L
  • PAIL: .66 U.S. Gal./2.5 L
  • BOX: 4.5 U.S. Gal./17 L
  • BOX: 3.5 U.S. Gal./13.25 L

Colors:* White, beige and yellow

*Some sizes and colors may be available by special order only.

Standards and Codes: Manufactured to conform to ASTM C475/C475M.

  • Premixed and ready to use right out of the container
  • Fast drying (in as little as 4 hours)
  • Minimal shrinkage
  • Sands easily
  • Extremely smooth finish with fewer passes
  • Excellent coverage and adhesion
  • Superior performance through finishing tools

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 (4–6 in.), apply compound to the joint formed by the tapered panel edges. Press joint tape into the compound, removing excess material. Allow tape coat to begin to dry then using a ­finishing knife, trowel or mechanical tool (8-10 in.), apply a ­fill coat of joint compound over embedded tape. Remove excess material by feathering the center and the edges of the joint. Allow compound to dry thoroughly.

Step two: A ­finish coat should be applied over the Step One application to fi­ll any voids or shallow spots. Remove excess by feathering and allow to dry completely before sanding. Compound can be applied up to 1/4 in. thick without cracking.

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

Fastener Heads and Trim:
Rapid Coat®Extra Lightweight can be applied to fill corner beads and conceal fasteners (nail/screw dimples). A second coat should be applied when dry. Apply a third coat over the fasteners if needed.

Rapid Coat® Extra Lightweight washes off easily with warm water. Tools should be dried thoroughly to prevent rusting.

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® Extra Lightweight 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, fills imperfections and eliminates texture 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 joint compound is thoroughly dry (See GA-236). For best results, a good quality gypsum board primer should be applied, in accordance with manufacturer’s instructions, before painting or wallpapering.

Rapid Coat® Extra Lightweight can also be used to texture walls and ceilings. For best results, apply a high-quality gypsum board primer before texturing, making sure to follow the manufacturer’s instructions. Joint compound can be applied (up to 1/4 in. thick) with a roller, sponge, brush or trowel to create the desired effect. Paint over when dry.

Product & Safety Precautions
  • Apply to clean and dry surfaces.
  • Protect from freezing, extreme heat and direct sunlight.
  • Maintain minimum 55º F (13º C) working temperature.
  • Do not mix with any other product or material (such as chemical setting compounds or Plaster of Paris).
  • If separation exists, re-mix thoroughly, taking care not to introduce air bubbles.
  • If thinning is required, such as for machine applications, water may be added in small (4 oz.) increments. Excessive thinning of the product may cause cracking, increased shrinkage or other undesirable results.
  • Allow compound to dry thoroughly between coats and before painting.
  • Keep container tightly closed between uses.
  • Wear safety glasses at all times.
  • Wear a NIOSH-approved respirators during sanding or other dust-producing activity due to potential for dust to exceed exposure limits. Exhaust ventilation may be required during dust-producing activities in areas with poor ventilation.
  • Safety Data Sheets (SDS) are available for all Continental products upon request.

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