How to Use Polyester Resin Paint


Polyester resin paints provide a protective, waterproof finish to surfaces. These paints are durable and cheaper than epoxy resins, but they produce dangerous fumes and are flammable until cured. In addition, the resin and hardener must be properly mixed according to a measurement chart. Each brand requires different mixtures depending on the temperature and necessary dry time. In general, mixtures with a larger amount of hardener will dry faster and the colder the ambient temperatures, the more hardener required.

Things You'll Need

  • Polyester resin with hardener
  • Mixing bucket
  • Stir stick
  • Mat cloth
  • Paint brush
  • Consult the temperature chart that came with the polyester resin paint and hardener. Find the approximate ambient temperature on the chart and follow it to the amount of hardener necessary on the graph. This will most likely be between .5 and 2 percent of the amount of resin.

  • Select an outdoor area to work, and move all necessary equipment and chemicals to this area.

  • Measure the correct amount of hardener and pour into the resin. Mix only the amount of resin necessary. It will begin to cure within 30 minutes and cannot be used once it begins to gel. Use a stir stick to mix thoroughly.

  • Coat the surface with resin. Allow to cure until sticky, usually between five and 10 minutes.

  • Unroll and trim the mat cloth to the size and shape of the surface being painted. Lay the mat cloth on the surface and press into the resin. A wallpaper roller, dowel or other tube can be used to quickly press out air bubbles.

  • Allow the resin to cure for the time noted on the temperature chart before handling. This will vary based on ambient temperature and the thickness of the resin coat.

Tips & Warnings

  • Any spills and paint brushes should be cleaned immediately with acetone.
  • If no well-ventilated area or outdoor space is available for applying the polyester resin paint, a rebreather mask should be worn.

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