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Duraglass Body filler

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Automotive Polyester Body Filler

Another Unique Time Saving Product that Files and Sands with Ease!


Duraglass represents the very latest technology and development in filler formulation and is a very strong fine flexible high quality automotive polyester filler that has been specifically formulated for use by the Professional tradesman for fast amazingly easy panel repairs and provides outstanding adhesion, low shrinkage, minimal pin holes, with exceptional easy dust free sanding properties.  Duraglass is designed to repair and fill all types of panels in steel / fibreglass on cars, vans, trucks, buses, boats etc, and can also be used to repair wood / timber surfaces, weatherboards, interior or exterior wood.

  • Professionals choice
  • Fast amazingly easy to use, cures in 3-5 minutes depending on ambient temperature
  • Unique Properties - files and sands with ease, even twenty minutes or two hours later.
  • Anti sag properties, even thick films hold up on panels
  • Exceptional increased adhesion to metal
  • Minimal pin holing
  • Low dust / healthy to use
  • Summer and Winter grades available

Operating Tips:

To achieve the best performance from automotive polyester fillers and to assist with the use of Duraglass we highly recommend the follwoing:

  1. Ensure a minimum of 2 % - 3% Benzoyl Peroxide! is always used, amounts less will cause bleed through, as there will be insufficient catalyst to thoroughly cure the polyester, this leaves free amine to bleed out through the paint.
  2. Thorough mixing to achieve complete colour change is essential this improves adhesion / stops pin holing and also prevents bleed through.  Mix with a folding, scoop, flop and drag action and always spread a layer out on mixing board to press and extrude all the air entrapped, then retrieve small quantities and use, apply to the panel, build up in thin layers, extruding the air each time.  Always build higher than the repair to allow for sanding.  Try to avoid stirring action when mixing.  A second or third coat may be required.
  3. Do not use Winter grades in the summer, as its not possible to include sufficient Benzoyl Peroxide!
  4. Always immediately apply a waterproof Primer to the filler after all repairs have been completed, even if the vehicle is to stay inside the workshop, and especially if its stored, or is used outside, as all fillers are extremely porous and any water or even atmospheric moisture will penetrate the filler down to the metal and immediately cause rusting that will result in failure with loss of adhesion.
  5. Do not use Duraglass or any other conventional filler directly over rusty repairs always use a water-proof filler such as Autofix first then use conventional filler to finish, as failure will arise due to continued rusting causing loss of adhesion.  To further assist with rust prevention apply Autobodyseal Rustproofing Underseal to the inside panels after the repairs have been completed.  This prevents moisture ingress and then will prevent rusting.
  6. Always sand the surface all fillers before priming or painting.  Un-sanded filler will cause loss of adhesion and blistering due to tacky surface, even small pin holes or spot repairs should be sanded as these will also definitely fail.
  7. Ensure the lid is kept securely close on all fillers to prevent evaporation of the styrene (solvent), as this will dry out filler and moisture or water may enter.  This will cause massive pin-holing, along with future rusting.

Directions for Use:

For best results and improved adhesion it is important that ALL paint, rust, etc, be completely removed.  Sand back (or machine grind) to a good clean bare metal surface, always larger than the area to be filled, to allow for feathering.

Duraglass requires addition of 2-3 % Hardener.  Cut off nozzle leaving 1/4" outlet, press out a 1'' strip of hardener to half a cup of filler.  Sufficient hardener has been added when a strong even red colour change is seen, it is important to thoroughly mix hardener and filler together with a scoop, flop and drag asction until colour completely changes evenly throughout.  This mixing action forces out entrapped air and helps eliminate pinholing, never mix with stirring action.  Always spread out on mixing board to remove air then use.

Apply to surface with suitable spreader, using reasonable pressure, build up with thin layers (this eliminates pinholing), and leave dents slightly over-filled to allow for smoothing down.  It is easier to remove excess filler before a fully cured condition is reached using a surform or dreadnought file, 40 grit sandpaper can be used when fully cured, then use 100 grit paper for final finish.  Always coat repair with suitable primer, fillers should never get wet as this results in metal rusting and then loss of adhesion.

Store in a cool dark place.  Keeps well sealed down.  Do not use mixing tool for taking additional Duraglass from tin.


Contains Styrene Monomer.  Causes eye Irritation.  Vapour irritating combustible.  Hardener contains Benzoyl Peroxide.

Health & Safety:

Avoid contact with eyes.  Avoid breathing vapour.  Avoid prolonged or repeated contact with skin.  Keep away from heat and open flame.  Use adequate ventilation.  Keep container closed.  Wash thoroughly after handling.

First Aid:

In case of contact, immediatley flush eyes with plenty of water for at least 15 minutes.  Call a physician.

Warranty / Liability

Special Finishes (NZ) Ltd provides all the enclosed information in good faith but without warrantee and is to assist your application. However the use of this product being used is beyond their control. The manufacturers can accept no responsibility whatsoever for any damage or failure arising from its application or use. It is totally the responsibility of the user to insure that the product is suitable for its intended use.