If it is a quality fence, sliding wood against it won't harm it in the
least, and if it's not, it can be argued that it doesn't matter anyway.
That said, a little buffed up Johnson's Paste Wax, or TopCote, applied to
the fence will make the wood slide easier and mitigate some of the friction
that you are worried about.
Attach a piece of 1X6 to the fence. You can create a fence that is
taller and longer that will aid in certain cutting situations. It will
also protect your fence but you shouldn't be cutting the kind of things
that will really damage the fence.
I'm not doing any cutting that is actually damaging the fence but I have
noticed rubbing marks. I did clean it off and then applied paste wax. I made
a cabinet for my wife and found that the wax is working very well.
Thank you for the help
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