• Description for 3M 05821

    Designed to be used as a "skin coat" to fill minor imperfections in properly prepared body filler, steel, aluminum, SMC, fiberglass and OEM paint.

    *See Terms of Use Below

    Application Type Finishing
    1 Part or 2 Part 1 Part
    Material Form Putty
    Substrate aluminium, steel, Fiberglass
    Manufacturer 3M
    Chemistry Polyester resin with styrene monomer, Benzoyl peroxide
    Cure Method Room temperature cure
    Cure Time (min) 15
    Viscosity (cPs) 17,600 to 25,600
    Color Blue, Tan, Beige
    High Temperature Resistance (°C) 82
    Low Temperature Resistance (°C) -29
    Other Resistance Stain resistance
  • Technical Data for 3M 05821

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Putty
    • Substrate
    • Industry
      • Other - Filling of pinholes, minor dents, gouges, scratches, and stone chips in properly prepared body filler
    • Chemistry
      • Other - Polyester resin with styrene monomer, Benzoyl peroxide
    • Cure Method
      • Room Temperature / Air Dry - Room temperature cure
    • Color
      • Blue
      • Brown - Tan, Beige
    Specifications
    Cure Specs
    Cure Time (min) 15
    Viscosity (cPs) 17,600 to 25,600 Test Method
    Linear Shrinkage (%) <1.00
    Bond Strength
    Shear Strength (psi) 1,950 to 2,150, 640 to 840 Test Method
    Tensile Strength (psi) 1,950 to 2,150 Test Method
    Material Resistance
    High Temperature Resistance (°C) 82
    Low Temperature Resistance (°C) -29
    Other Resistance Stain resistance
    Conductivity
    Filler Steel, Aluminum, SMC, Fiberglass, OEM paint
    Hardness
    Shore D Hardness 31 to 39, 40 to 50, 43 to 53, 45 to 55, 50 to 60 Test Method
    Other Properties
    Flash Point (°F) 89.0 Test Method
    Business Information
    Shelf Life Details Store in a dry area at 72 deg F for optimal shelf life.
    Shelf Life Temperature (°F) 72
    Shelf Life (mon) Optimal
  • Best Practices for 3M 05821

    *See Terms of Use Below

    1. Application

      Sand properly cleaned surfaces with grade 80 - 180 abrasive, (Putty will adhere to sand scratches as fine as 320) Blow off with clean compressed air to remove all sanding dust.

      Mix applicable amount of putty with 2% hardener by weight (or one stripe across a 4" puddle of putty).

      Mix to a uniform color on a clean non porous surface spreading thin and pressing air bubbles out as you mix.

      Apply a "tight" coat pressing putty into defect areas and recoat if needed building slightly higher than the surrounding area.

      Allow 15 minutes cure time and sand with 150-320 grit abrasive to desired shape. For best results the finish sanded material should not exceed 1/16 inch.

  • Comparable Materials for 3M 05821

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Viscosity Test Methods
Viscosity Test Method Temperature
17,600 to 25,600 cPs Brookfield Viscometer @ 2.5 RPM 25°C
Tensile Strength Test Methods
Tensile Strength Test Method
1,950 to 2,150 psi ASTM D638-82
Shear Strength Test Methods
Shear Strength Type Substrate Test Method
1,950 to 2,150 psi Lap shear strength Steel to Steel ASTM D3163-84
640 to 840 psi Lap shear strength Aluminum to Aluminum ASTM D3163
Shore D Hardness Test Methods
Shore D Hardness Shore Hardness Test Method
31 to 39 10 Min.
40 to 50 20 Min.
43 to 53 30 Min.
45 to 55 60 Min.
50 to 60 24 Hour
Flash Point Test Methods
Flash Point Test Method
31.7°C ASTM D93 closed cup metod