Duratec® StyroShield™ Primer

5 star rating

Same Day Shipping

For orders placed before 2:30 p.m. ET


  • Item
  • Description
  • Price
  • Qty
  • 1042/69-A
  • 1042/69-A
    Gallon Kit with Hardener (6 lbs)
  • $144.95

  • 1042-A
  • 1042-A
    Gallon (6 lbs)
  • $139.95
  • 1042-B
  • 1042-B
    Case (4 Gallons)
  • $499.95


Spray on Styrofoam to Create a Plug

Duratec® StyroShield™ Primer is an air-cured polyester primer designed to be applied directly to polystyrene foam (Styrofoam™). StyroShield™ contains microspheres that, when cured, forms a barrier that protects polystyrene foam from the chemicals in polyester-based laminating resins, gel coats, tooling resins, and other Duratec® products. With StyroShield™, low-cost polystyrene can be substituted for urethane foam in plug, mold, and pattern-building applications, making prototype molds, and sealing forms for cast concrete.

Duratec® StyroShield™ Primer is the perfect choice for:

  • Making patterns from low cost polystyrene foam
  • Making prototype molds or mold-direct construction
  • Anchoring decorative paints onto polystyrene foam
  • Sealing forms for cast concrete
  • Sealing architectural fixtures

Spray StyroShield™ using an HVLP gun with a 2.5 mm or larger nozzle. Apply at least 20 mils of StyroShield™ to ensure complete coverage and surface protection.

When in storage, the microspheres in StyroShield™ will float to the top and form a hard crust. Thorough mixing is required prior to use. Use a drill-driven mixer or paint shaker. The crust can be mixed back into the primer. When possible, store StyroShield Primer container upside down.

Requires 2% MEKP.

Duratec® is a registered trademark of DURA TECHNOLOGIES INC.

warning WARNING: This product can expose you to chemicals including Styrene & Talc containing asbestiform fibers, which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov


Duratec StyroShield Primer gallon (#1042-A) and gallon case (#1042-B) units can be shipped via standard ground service without hazard charges within the 48 contiguous United States. The single gallon unit (#1042-A) will be subject to a hazard charge if shipped by air. This product in the gallon case unit (#1042-B) cannot be shipped by air. Please see our Hazardous Shipping Chart for more information about hazard fees. We will consolidate items whenever possible to minimize these fees.


Duratec StyroShield Primer StyroShield Primer is available in sizes that include: One gallon (#1042-A) One case of four gallons (#1042-B)


5 star rating

repairing mid-century furniture

Nov 28, 2020  |  By Zehra Kuz Mackin

I had 4 chairs made of styrofoam and one was broken. i needed a thermal barrier to be able to repair the chair with epoxy. StyroShield was perfect; it looks like it worked!

Quart size?

Feb 20, 2019  |  By kguo

Great product. Would it be possible to sell this product in quarts due to it's shelf life?

Product Q&A