I have a question. When I'm watching the tutorial videos the gel coat that's used there, is right fluid. I bought my gel coat at easycomposit but it's rather viscious and therefore not easy to apply. Should I thin it with something?

What temperature are you storing it at? If stored in a cold workshop over night it will thicken considerably. Anything below 20 degrees C will have an effect. Never had to thin any of the EC gels I've used.

before mixing A and B off course! or you can heat it in a bowl of water but keep the container closed and dont let any water going to the lid.

@ Matthieu: thanks for your tutorials. They help me a lot!