Lennie,
By putting on more 'glass or better 'glass you're making a stronger hull and a heavier hull. It will definitely be able to tolerate harder whacks.
But no matter what high strength fabric you use and how much you use it's all sits in a matrix of epoxy resin which is what suffers the appearence spoiling dings you mention.
If someone comes up with away to harden epoxy for better scratch resistence I'm sure we would all buy into it in a hurry.
Charlie

: I’m thinking of using plain weave S glass on my wife’s Guillemot. Looking to
: make a tougher boat one that will resist the everyday dings better. What
: thoughts are out there on lay ups?
: On the Deck I will use 4oz for sure.
: On the Hull I could go with 6oz with more 6oz on the bottom and on the stems.
: (standard lay up)
: Or 6oz with 4oz
: Or 4oz with 4oz

: Later,

: Lennie