I dunno but maybe some here might find this interesting...
In terms of what CP is actually good at, perserving a threads colour. When putting bright thread over a dark blank, even when using NCP thread, the dark blank can still creep through the bight or light thread.
In all three of these pics you'll see the left side of the bind is plain NCP yellow thread over the top of a nude graphit blank. On the left side of the spiral inlay I've split the right side into half again. The half closest to the inlay has 2 coats of CP the outside has 1 coat.
This first pic is A thread, the pics don't quite do it justice but the left side looks very dull in life (plus theres a dried bit of CP scum in it before I pulled it off)
These next two are both C thread with different ratios of epoxy and thinners, again in life there is a lot more difference than you can see in these pics but there is a lot.
Again you'll have to look closely but the difference is there and the inner part of the right side gives much better colour. The other difference is that the last pic has two c threads as inlay the top two have one metalic A and an ncp C thread inlay. There is a much higher consentration of thinners in the top two pics than the bottom pic. The higher the thinners the more transapent the thread can go, even with some NCP threads.
The a thread looks horrible so there sometimes a C or D thread is still the go for underbinds