Hi Javier,

There's only 3 things that could cause the epoxy to not cure properly:-

1) The mix ratio - you need to be really accurate with your measurements. Measure by weight, not volume. Aim to be acurate to 1g.
2) The thoroughness of the mixing - always ensure you spend lots of time to carefuly mix the epoxy and hardener together
3) The temperature where you're working - It is essential to maintain an ambient (workshop) temperature of 20'C or very close to 20'C. If the temperature becomes too low then the epoxy can slow down or stop curing altogether. I would suggest putting your part somewhere very warm to see if you can 'kick-start' the cure again.

Try heating the part up before you resort to stripping the uncured resin off.

--Matt

Matt Statham
Easy Composites / Carbon Mods - Technical Sales

Hi,

Definitely the workshop temperature was the problem. I placed the paddle in a smaller room with a little electric heater and it worked perfectly.

Thank you again for your help.

Javier.