For stone chips, the manufacturers manual says fill void with an appropriate Epoxy resin (5 min. Epoxy), sand the filled spot with sandpaper, apply lacquer
layer to protect the repaired spot against moisture. Biggest challenge is to get someone to actually read and understand section 6 of the MT operation and installation manual.
During the next repair/overhaul which for me is 2400 hrs and 72 months they will have a look at these areas again. The blades themselves have no life limit.
MTs are very big in north america and canada, maybe in 50 years Australia will stop reinventing aviation, in the US putting some epoxy on a blade, sanding it back, and spraying lacquer is something the owner can do.