Considering what you've been able to achieve with Pitt grays, I can hardly wait to see what you can do with Copics!

One interesting thing about them, is the tone doesn't stack.---Conrad

I think that -very- much depends on a) Paper stock and b) whether you've let the first application dry or not.

-D

on Strathmore 400 series 80lb paper. I haven't noticed any darkening

if I let them dry.

However, it's obvious from your statement that trying other paper might be the way to go, -if- you are looking to layer. 

I just tried it on the thin sketch paper I have lying around here and it layered just fine.

I was using a Copic W-1.

(I apologise as maybe this ought to be it's own topic as this appears to be thread drift)

Oh agreed, but it takes quite a while for it to really "set" which is why I didn't mention it.   I just did a time-trial on some Strath 500 sketch card stock (see below), Under normal working conditions I've had no problems on 400 series Strath 1-ply sketch (though it will bleed through that--backing sheet is necessary), and certainly no problem on 500 series Strath.

As you can see, you are perfectly safe at two minutes, which is an awfully long time when it comes to laying down tone with a marker, and (depending on what you are doing) you may be fine at five minutes.

Not to hijack the thread, but if anyone is interested, I could try the same experiment with blender underneath to see if that makes a difference one way or the other.  We can certainly make another thread if there's some interest?

Nice vid, btw!