This instruction manual answers all your questions, both theoretical and practical, about crafting with glass fibre, or GRP (glass reinforced plastic).
It is really a pocket reference for anybody who works with any type of GRP including Kevlar and carbon fibre. It starts with a brief history lesson and then leaps into the different materials, their pros & cons, how to work with them in many ways, how to mould, laminate, repair - anything from scale models to full sized cars, yachts, furniture, water tanks, fish ponds and more.
The text is simple but thorough and is both pragmatic and theoretical. If you want technical specifications you will find those too.