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Polyester Resin & Gel

Polyester Gelcoat is the very upper layer of the GRP Composite System. It has a number of functions.

  • Provide a smooth, glossy finish to the composite, hiding the glass and resin structure
  • Add water and chemical resistance to the composite

Unsaturated Polyester Resin is used along with glass fibre reinforcements to provide a composite. Its primary functions are to:

  • Wet out glass reinforcements to provide strength
  • Produce home made filler pastes with the addition of talc
  • Cast solid polyester resin objects

Unsaturated Polyester Resins & Gelcoats are by far the most common used in GRP Manufacture but there are modified versions for tooling and casting.