well,as ive graduated as auto bdy repirs guy in my past,id just do some plastic welding into the scale and then just grind and polish it.maybe someone in your local auto shop might help u with it,if they repair busted plastic bumpers.
basically you could also do it at your home by yourself,with a hint of alcohol(90% or higher) or nailpolish without oil.with this you can clean any greas from crack.
then the second thing youll need is a donor-material from some broken sak.just cut slices of the old donor scales.youll need em later.and keep em very clean from any grease etc.
now,grind a groove to the crack,from its end to another end,about 2mm wide.
then,apply more nailpolish into some t-shirt or other cloth that doesnt lint..and gently press the cloth with entstick into groove,move it from grooves end to another end,to let polish soften the scales a bit.be careful not to drip any polish into not-broken areas.
then after the plastic starts to melt(gives a little friction when tryin to move that cloth again),pick one of the plastic strips you have carved from old donor-scales,melt it with blow torch-type lighter etc.dont let the melting plastic light up or change its colour to any brownish colour...and just try to carefully either drip or drag the melting plastic from strip to that groove.you can also try to soften the scales with torch but its very risky if you have large noxxle in torch.
let the groove fill with molten plastic,let it come over the factory level.then let it cool down.
after this,add some epoxy on backside of scales.if the crack has gone thru scales,just make a small groove there too and fill it with either molten scale material or epoxy.
after this,just be patience as you grind&sand the new added material,and polish it to new glory.
this is how id do it anyway
its just like bumper repairs but in small scale all over.
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