some merinque powder in the buttercream can help and also use alot of buttercream after the crumb coat with a spatula ran under hot water and then dried off with a paper towel there should be enough icing that the spatula never touches the actually cake.
Thin out the buttercream so it is very thin. I can actually see the cake through my layer of crumb coat. May sure it is completely covered to seal in all of the crumbs. I then pop it in the fridge for just a couple of minutes (3-4 minutes) and apply my regular consistency buttercream.
Quote by @%username% on %date%
%body%