I'm very new to composites but wondred the same - I came across this video recently 

You could try this:

Wet out a suitable piece of cloth on a release coated glass plate or a piece of polypropylene sheet.
use the slowest hardener with the resin, and make sure to get the CF wetted through.
Use a roller to squeeze out excessive resin and air bubbles.
Put the whole thing in a plastic bag and use your vacuum pump to get as much air out as you can without pulling enough vacuum to disturb the weave on the plate,

Make several and put them in the freezer until you need it ...  thaw it  before use, keeping an eye on it, until it has the desired "consistency"
it will be a lot less sticky/gooey than when wetting it and quite stiff, and will not distort unless you work it really hard.

Lay this first layer in your mould  (taking care to keep the weaves nice and straight... then lay up the rest of the layers, and vac bag....)

I'v only done this once, and it worked a treat, but it is NOT easy. The cold resin warms up quite fast, gets sticky and the weave starts to distort.

Good luck..

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It's the only way when working with dry fabrics. You can use a surface tissue as well. 

Ok but my question was about only 1 layer, like industrial prepreg. 2 layers would be too thick for working.

Just spray tack 2 layers together. 

I was wondering if there is a way to create a resin to drop on a tissue to obtain a material whose appearance is similar to industrial prepreg, that is to say a material whose weaving is not deformed during the layup or very little.




Thanks,