: Kevlar all by itself will not make a really strong layup. It will be too
: flexible. It is advisable to add some glass or other material between
: layers of Kevlar. The outermost layer as glass is also a good idea as it
: handles abrasion better than Kevlar. 4 layers of material is probably the
: minimum. Areas that see impacts may benefit from more.

I used Kevlar as an experiment on a stitch-n-glue boat a few years ago. Glass is necessary for the outermost layer, which acts as a sacrificial layer. You can't sand Kevlar smooth; it just abrades and gets fuzzy. So you lay down the glass as the outermost layer and sand it.