So, I have been a big lurker just learning all I can. My last cake was one disaster after another starting with the BC crumbcoat. I made it thinner with water and milk but it was so wet it wouldnt crust even after being in front of a fan for 30 minutes. So I had to "wipe"/scrape that layer off for fear that it would make my cake soggy and also it wouldn't crust making icing the whole thing an even bigger problem. I survived by icing with the BC really thick.
So whats the trick to a nice thin BC crumbcoat?????
Thanks so much, I love this site and when I can get my darn camera to download to this pc I will be able to post my cakes.
The crumb coat just needs to be a little softer. You probably just added too much extra liquid. If you are using a buttercream that is already soft, you may not have to add any additional liquid.
If you can take a spatual full of icing and easily spread it over you cake with out tearing much crumb, then it is right for a crumbcoat.
Rather than adding liquid, sometimes I'll gently heat my crumb coat icing to soften it. Just 8-10 seconds in the micro usually does the trick.
I find that if I let my crumbcoat sit for any length of time, it tends to want to slide off the cake. I have to ice within 5 minutes of crumbcoating or I'll have a big mess on my hands. My cakes are pretty moist. 
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