Store your fabrics in a low temperature and low humidity room or wrap them in a polyethylene film. Although carbon fibers are not vulnerable to hot temperatures and humidity, the sizing agent or binder that keep them together is. Moreover, humidity on fiber surface lower the adhesion strength between fibers and matrix.
Spread tow fabric manipulation
A spread tow fabric is woven from spread tow tapes made of parallel fibers maintained together by a sizing agent. A compromise has to be found between dry tape consistency and fabric ease of impregnation. When handling a spread tow fabric, it is important to use a method that causes the lowest possible friction to the carbon fibers. The eraser ends of a pair of pencils are useful to grip and manipulate spread tow tapes.