No, that won't work. And if you might get it down the part will look horrible, because the fibres will be disoriented quite a lot. The main problem is the prismatic shape in the middle. Fibres which go across this shape will need to be much longer than fibres which run flat along the shape. This will leave a heavily diagonally streched area on both sides of the shape. This isn't a prepreg problem, this will always be the case.

Hi Hanaldo,

Thank you for your feedback ! I can have access to a fairly good oven, I may give a shot to the prepreg to see how it goes.

But watching the EC video on out-of-autoclave prepreg, they make their part cutting multiple small pieces with some overlap between them. That makes the positioning of the prepreg easier, that I can understand, but then the thickness of the final part is not homogenous as it will be thicker everytime two parts overlap. I need a quite homogenous thickness of 2 mm. I have never worked with prepreg. Is it

Thanks!

Pre-preg would be easier to achieve a good result. In terms of lay up, you can actually use wet-lay in much the same way as pre-preg by creating what is called a 'wet-preg'. Basically just putting your reinforcement between two layers of plastic, pouring your resin over it, and then using a squeegee to wet out the reinforcement and squeeze out excess resin. Then if you leave the plastic in place, you can cut the reinforcement as accurately as you could a pre-preg, allowing you to use templates to kit out for your mould geometry. If you leave the resin to cure for a little bit, you can choose how tacky you want your material to be for laying into the mould. You can use it wet, or you can let it cure to a b-stage, where it would handle exactly the same as a pre-preg. You can even stick it in the fridge or freezer to slow the cure or keep it for another day. 

In terms of the result you will get using that method, it is still a wet-lay and wont be comparable to a proper pre-preg. But it may make the process much easier for you, allowing you to achieve a better result than you might have with traditional wet-lay methods. Certainly if you have the facilities and equipment to use pre-preg, that is a far superior process and definitely a path worth going down.

OK...here is a part that I am making. Here is the mould. I did it with the EC gelcoat and paste for high temperature, anticipating that I could then use it for hand layup and prepreg. I am making my first part by hand layup (because I need to check all dimensions are good at the end). But man it was a mess with all the shapes...do you guys think that I would really be better with prepreg or would it be just as hard ?
Thanks !