Optimus 820

Chemical Resistant Adhesive & Caulking – Vertical Hold 

Product Description
820 is a thixotropic, fuel resistant, quick set reactive gel polymer compound used as an adhesive material for various substrates, plastics and concrete. 820 is thixotropic, holding a vertical bead when applied from a duplex cartridge. The product bonds to fiberglass and may be used for sealing fittings on fuel sumps, repair of fiberglass tanks and used with to quickly fill cracks in containment tanks that will be surface coated. It also is used as a filler for surface imperfections in concrete and other materials. With quick set-up time, 820 provides for rapid applications where vertical bonding is required. The product is also excellent for sealing of cracks in concrete for structural injection and sealing around injection ports. 820 can be dispensed via plural component pump machines, troweled and moved as needed for bonding and filling of various substrates.

Various Set Times:   
820 is designed to set with several gel/set time speeds:  820-45/60 is 45 to 60 seconds gel time, 820-60/120 seconds, 820-240/360.  The product set time is temperature dependent, i.e., warm or hot conditions will speed the set time and cool conditions will slow the set time.

Color:  The product is black or non-pigmented having a whitish color when mixed properly and after it has set.  820 has no odor and is 100% solids.


  • Vertical hold directly from the cartridge or static mixer
  • Can be sprayed over with polyurea
  • High chemical resistance, fuel resistant.
  • Highly adhesive to many substrates
  • Fast set, trowel-able
  • Bonds to plastic, urethane, polyurea, fiberglass, steel, wood and concrete
  • Cartridge dispensed
  • Can be sanded and painted quickly

Use Areas

  • Rapid “bug-hole” filler for polyurea spray applications or floor applications
  • Plastic repairs
  • Food processing areas – floor repair
  • Vertical Surfaces – sealing and repair
  • Used as caulking and self-leveling applications
  • Waste holding & treatment areas – sealing and repair
  • Petrochemical production floors
  • Pulp and paper
  • Waste Treatment facilities
  • High traffic industrial floors
  • Used for immediate crack and damage repair for decorative floors

General Physical Characteristics

Solids 100%
Hardness Shore D 60-63 
Mix Ratio 1:1
Tensile (lb/mil)   2300
Color     Natural or Black 
Viscosity cps @ 72°F   Part A: 1000+/-300
Part B: 1700+/-500
Weight/gal  Part A: 10 lbs
Part B: 8.8 lbs
Specific Gravity Speed Varies
Gel Times 6-10 min. @ 75°F


 **Speed is temperature dependent Sanding Time depends on set time of product.  Faster set provides faster sand time.  Hot conditions speed the set time, cool conditions slow the set time.

Application: The product is mixed and applied via a 1:1 duplex cartridge or a plural component 1:1 ratio pump fitted with the proper static mixer.

Surface Preparation: 
Surface is to be free of all contaminants that would act as a bond breaker.  The area to be sealed should be sound to the degree that good bonding of the sealer will result when properly applied.  The area should be dry.

Plastics:  Abrade as needed, solvent wipe and prime.  Consult Madison for various substrate primers.

Concrete:  Must be cured at least 28 days.
All surfaces must be dry and dust free.

Limitations:  Do use on wet surfaces or expose part A to moisture.  Keep out of direct sunlight, store at room temperature.
Always shake the part B before using.  Do not allow the product to stand in the static mixer.  Use at 5 degrees F above dew point.
Keep cartridges warm when using product in cool conditions.

Shelf Life:  Six months; store between 40°F and 100°F.
Finish:  This product has a High Gloss finish and can be sanded and painted as needed.

Packaging:  Duplex cartridge kits, 10 gallon kits, 100 gallon kits.

VOC Content:  0gms/1 or 0.0 lbs/gal

Pot Life:  No potlife, dispensed from pumps or cartridges. 

Curing Time:  Depends on set time of the productRecoat 2-8 hours @ 70°F.  Full cure in 24 to 48 @ 70°F.   This product is for use by professional applicators only. Wear Protective Clothing. Read MSDS before using this product. DOT/Flash Point – Non-flammable Liquid Classification, not regulated.


Step 1

Clean channel, abrade as needed apply 810, moving quickly around the perimeter of the tank.
Step 2

Clean channel, abrade as needed apply 810, moving quickly around the perimeter of the tank.
Step 3

Clean channel, abrade as needed apply 810, moving quickly around the perimeter of the tank.

Step 4

Clean channel, abrade as needed apply 810, moving quickly around the perimeter of the tank.