Valley gutter/flashing - fibreglass repair?

I've got a roof job, there's a valley gutter like this:
___________E____________ |\ /| | \ / | | \ / | | \ / | | \______R_______/ | R = ridge | |\ /| | E = eaves | | \ / | | GE = gable end | | \ / | | VG = valley gutter | | \ / | | | | \ / | | E R \ / R E | | || | | | | ||<-VG | | | | || | | |_GE_|_GE___||__GE__|_GE_| | | | | | | | FLAT ROOF | | | | | | | |_______________|
The valley gutter discharges onto the flat roof (felted). The gutter is about 2" deep, and 12" wide, with flashing extending under the concrete tiled roof. There are various faults in this gutter - it should be replaced.
Now, lead for this will be pretty expensive - I am toying with the idea of lifting the first row of tiles, and then, over a release layer, using fibreglass resin/matting to form a new layer over the existing leadwork.
Any helpful comments as to the suitability/longevity of this idea will very useful. What do you think?
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