Quote from Dan Lee on 19th May 2023, 9:23 am

Again, apologies for the late reply!

This depends a bit on the size of boat and what you are wanting to gain from the glass. In most of the boats that I do, the glass is just a backup offering abrasion resistance to the bottom, protecting the wood from gouging. 

As an example on Miss Isle I used one layer of 200g plain wave glass cloth which I think I overlapped at the keel giving a double layer for a section maybe 3 inches either side of the keel. 

This is the type I used: https://www.ecfibreglasssupplies.co.uk/glassfibre-cloth-200g-sq-mtr-plain-weave-1mtr-wide