HI,, I crumb coated my cake,, put it in the freezer,,, took it out the next day.. i covered it with buttercream and was waiting for it to crust so I could smooth it with parchment paper and a fondant roller..but it wouldnt crust.. it stayed moist because it was thawing out.. so it was ''sweating''... how long should I have waited for it to thaw before putting the icing on it? thanks