Hi, Are you planning to update shader to 5.1? Looking forward to it!
Is there a way to have the Retro Reflective color added to the Flakes? I did not succeed yet.
Yes I will be updating it to 5.1 in the coming weeks.
You will need to create a mask for your metallic flakes, white being retroreflective, black being not retroreflective – then plug that into the retroreflection mask output. 
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Thanks rdtg
has any update for ue5.2?
Hey there. Have you made any progress on your search for retro-reflective material?