Polyesters

GRP Fibre Glass Polyester Casting Resin or Polyester Gelcoat



1. Weigh out the desired volume of resin or gelcoat into a suitable container
2. Calculate the catalyst required at a ratio of 1.5-3% by weight 15g to 30g per kilo
3. If preferred add catalyst by volume at 13-26ml per 1000g
4. Stir very well, trying not to entrap any air and ensuring you get right to the edges and bottom
5. To be sure of full catalysation, tip from one pot to another after first mix and re-mix
6. Allow to stand for a few moments for air release (casting resin only)
7. Tip into the mould or paint onto the surface
8. Allow to cure (see the data sheet 6060_TECH.pdf (resin) or neo2000_TECH.pdf (gel) for cure times)
9. Cure times will vary on catalyst added and ambient temperatures. In cold climate add extra catalyst to a max of 4%

Water Clear Polyester Casting Resin
1. Weigh out the desired volume of resin into a suitable container
2. Calculate the catalyst required at a ratio of 1.5-3% by weight 15g to 30g per kilo
3. If preferred add catalyst by volume at 13-26ml per 1000g
4. Stir very well, trying not to entrap any air and ensuring you get right to the edges and bottom
5. To be sure of full catalysation, tip from one pot to another after first mix and re-mix
6. Allow to stand for a few moments for air release
7. Tip into the mould
8. Allow to cure (see the data sheet 0328_TECH.pdf for cure times)
9. Cure times will vary on catalyst added and ambient temperatures.

--Ensure your mould is free of water or dampness before casting- this will inhibit cure in top layers
--Try not to cast in freezing cold or overly damp conditions
--Ensure you resin is fully mixed, if it's not you will get pockets of uncured resin
--Be as accurate as possible with weighing catalyst and resin - buy digital scales 1g increment for larger volumes, 0.1g increments for less
--Ensure you are adding the right amount of catalyst. Add more if your mould is dry and resin is fully mixed yet still tacky on demould
--In cold conditions you will need more catalyst. If you get yellowing or cracking that is too much catalyst!
--Wipe uncured surfaces with acetone and buff with a wax to save the piece, though this is not guaranteed to save it!
--If your resin is colder than 23 celsius and the ambient temperature is cold then the cure time will substantially increase.