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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.

£4.99 (£5.99 inc tax)
Please note that we no longer print and include datasheets with your order. All datasheets are available for download on the item where your purchase was made. It is the responsibility of the purchaser to download and read the information. Please think of the environment before deciding to print!, Polyester Resins are cured with MEKP, a corrosive peroxide. It is added at 0.75% to 4% by weight. We do not recommend under 1% as any error in weighing may mean the product fails to cure. Adding more MEKP will reduce the working time (POT or POTLIFE) and mean the resin reaches peak exotherm faster. It will not make the system exotherm any more than with a lower dose, it simply gets to its cross linking temperature faster. It is a myth that adding less MEKP affects the maxium exotherm temperature! Weigh out the desired volume of resin Calculate the required catalyst (1-4% by weight) Add the catalyst and stir well ensuring you combine the whole mix Stand briefly to degass If using degassing equipment bear in mind the vapour pressure of the product. Excess drawn vacuum will boil the product Pour and allow to cure
Low viscosity polyester casting resin for models and minor GRP repairs. Will laminate as well as cast!
In stock