Another thing I was told years ago on a course somewhere is that when you do the crankcases you should put the same amount on the pillars that the main bearing bolts go through even though they are inside the engine to get an even clamping force, sort of made sense to me at the time so always do it. Trick with credit card is good idea alsp i always put the smalest bead possible on the outside bit of the joint surface and a very small bit arround any bolt holes to stop oil apearing under bolt/screw heads.
Hope that helps mate and best of luck