USC DURAGLAS Specialty Body Filler


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USC DURAGLAS® Specialty Body Filler

DURAGLAS® Fiberglass Filler is the original fiberglass reinforced automotive body repair filler. Formulated with short-strand fiberglass fibers, DURAGLAS provides ultimate strength and durability on rust-outs, holes, tears and cracks. DURAGLAS is ideal for use on metal and fiberglass panels and is 100% waterproof.

Features and Benefits

  • Short-Strand Fiberglass Filled: provides a neat filling of imperfections
  • Rustproof and Waterproof: ensures durability of application
  • Versatile: can be applied on both metal or fiberglass panels
  • Hardener included
  • Available Sizes: Quart or Gallon size

How to use fiberglass filler for repairing imperfections

  1. Ensure both the filler and supplied cream hardener is at room temperature. Mix properly from top to bottom and knead hardener tube. Use 2% hardener by weight of the filler (or 50:1 ratio). Blend them together with rapid and forceful movements. Following the right proportion of hardener is essential to get desired results.
  2. Coat one side of the fiberglass cloth properly with the mixture and put it over the hole with the mixture side on top of the prepared surface. Use a spreader to flatten and smooth around edges to eliminate air bubbles and to promote adhesion.
  3. Use gentle pressure to press the center of the cloth to create a slight dip. Let some room be for the next coat of the filler mixture. Leave it for 10-15 minutes to cure.
  4. Prepare a mixture of additional filler and hardener as required to apply to the area along the original application's contours. 
  5. For finishing the repaired surface, sand for about 15-20 minutes, after which you can featheredge repaired area to desired contour.

Suitable Substrates:

  • Steel
  • Concrete
  • Aluminum
  • Masonry
  • Fiberglass
  • Wood
  • SMC – can be used for cosmetic repairs. For structural repairs prone to high degrees of stress and flexibility, use an SMC repair product

Technical Specifications:

  • Appearance as Packaged: Blue-Green
  • VOC
  • Packaged: 242 g/l
  • Applied: 2.0 g/l
  • Weight Per Gallon (Density): 13.8 pounds (Average)
  • Maximum Recommended Thickness (sanded): 1/4"
  • Viscosity @ 77°F: 220,000 cps
  • Gel Time @ 77°F: 3.0 – 3.5 minutes
  • Shore "D" Hardness Values @ 24 hours: 75-80
  • Sanding Time @ 77°F: 15-20 minutes

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