Application Type Finishing 1 Part or 2 Part 1 Part Material Form Putty Substrate aluminium, Fiberglass, steel 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
- Coating - Finishing
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Other - Filling of pinholes, minor dents, gouges, scratches, and stone chips in properly prepared body filler
- Other - Polyester resin with styrene monomer, Benzoyl peroxide
- Room Temperature / Air Dry - Room temperature cure
- Brown - Tan, Beige
Cure Time (min) 15 Viscosity (cPs) 17,600 to 25,600 Test Method Linear Shrinkage (%) <1.00
Shear Strength (psi) 1,950 to 2,150, 640 to 840 Test Method Tensile Strength (psi) 1,950 to 2,150 Test Method
High Temperature Resistance (°C) 82 Low Temperature Resistance (°C) -29 Other Resistance Stain resistance
Filler Steel, Aluminum, SMC, Fiberglass, OEM paint
Shore D Hardness 31 to 39, 40 to 50, 43 to 53, 45 to 55, 50 to 60 Test Method
Flash Point (°F) 89.0 Test Method
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
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
|17,600 to 25,600 cPs||Brookfield Viscometer @ 2.5 RPM||25°C|
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|
Tensile Strength Test Methods
|Tensile Strength||Test Method|
|1,950 to 2,150 psi||ASTM D638-82|
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|