Tectyl 121BN

Tectyl 121BN

0.00 LBS


Tectyl 121BN Black Undercoating, is a premium asphalt based rustproofing undercoating cutback with mineral spirits formulated specifically to provide quality sound deadening and to prevent metal and wood surfaces from corroding with exceptional corrosion protection from moisture, salt, or abrasion for new and used transportation equipment.

Tectyl 121BN is a thixotropic, meaning the undercoating in its uncured state is more of a gel-like consistency while becoming more fluid with continued mixing and agitation.
This characteristic significantly increases ease of application, spreading, and overall product flow.

The cured film provides a black finish that is firm, flexible, and resilient. This powerfully stable and conforming base layer allows for additional coats to be applied without the fear of peeling or cracking.

Product Uses

  • Black Abrasion Resistant Undercoating offering superb rust protection for new and used Transportation Equipment including Automotive Vehicles, Trucks, Buses, Trailers, etc. as well as cargo containers calling for corrosion protection.
  • Can be applied to both Metal and Wood surfaces providing exceptional direct to metal and wood adhesion.
  • Excellent protection of wood flooring found on most over the road fleet, landscaper, carry-on, enclosed, and heavy-construction trailers.
  • Popular undercoating with dealerships prepping used vehicles for reselling.

Product Performance:

  • When applied at the recommended wet film thickness (WFT) of 20-24 mils over the surface profile, it will deposit the recommended dry film thickness (DFT) of 10-12 mils. 
  • Dry to touch in 2-4 hours, weather resistant after 4 hours, and fully cured after 24 hours. 
  • Covers 74 square ft. per gallon when applied at the recommended dry film thickness (DFT)
  • Can provide up to 2 years of outdoor protection and 5 years of indoor or undercover protection on metal and wood substrates at the recommended dry film thickness (DFT). 

Application Equipment Recommendations: 

  • Pumps with ratios of 15:1 or greater are advised for efficient use of container content.
  • Tungsten Carbide Nozzles Tip in the spray gun is recommended. (.019" to .025" tip orifice size)
  • High Pressure Fluid Hose of no less than 3/8 in. diameter is suggested for less than 50 ft. of material hose is required.
  • Low Ratio pumps (15-30:1): operate through 100 ft. of 1/2 in & 50 ft. of 3/8 in. hose for a max of 150 ft. 
  • High Ratio pumps(>30:1): operate through 200 ft. of 1/2 in & 50 ft. of 3/8 in. hose for a max of 250 ft. 


For additional product information as well as storage and handling requirements, refer to the Product Data Sheet or Safety Data Sheet provided on this page.

There aren't any reviews yet. Write a Review.

What is Rust (and how can you stop its reign of terror)?
Bizrate 2023 Platinum Seven Time Winner

Safety Data Sheet
Product Data Sheet

Due to these products being hazardous, an additional shipping charge of $25.00 is automatically added to smaller "Ground Shipments". If you can order any combination of products that makes your total cart weight over 150 lbs. (which is considered "Freight Shipment"), this additional fee is waived. This can equate to considerable savings on shipping.

Sunoco Race Fuels is offering a Free Drum Pump with the purchase of a 54 Gallon Drum of Sunoco E85-R 99 Octane Race Fuel.
To add the free drum pump, first add the '54 Gallon Drum' to the cart, then click the blue 'Add FREE Drum Pump' button.

By entering your amount in the “Quantity” field, the price will automatically reflect the bulk discount below.