Pre-Preg

Easy enough to fix if you know what you are doing.
Not quite as easy as wet laminate that the gliders are made of today

run of the mill pre-pregs are heavier then a careful wet layup but the pre-pregs allow for a less skilled labor force. When reducing the amount of material, the orientation and wetout become super important. With prepregs the resin/matrix ratios are more predictable and variations in skill are all but eliminated, The shape of the pieces is also more fixes as the resin holds the fibers in place and there is much less distortion. Pre preg is also much faster to construct. If sailplanes were to be wet layup the costs would be in the range of 15-20% more.

So what you are saying is that if we all move to pre preg sailplanes we save 15-20%? Why is no one in Europe doing it?
I personally see no reason why a wet laminate would be better or lighter
Based on the square meterage of the material vs the time saved you would probably save a little on prepreg, and open a whole new window of opportunity in other areas.