Homebrew PCBs

Afternoon all.

I've made a couple of attempts at etching/drilling and have had a few 
tracks lift during drilling.  

I've always lacquered before drilling and I'm beginning to think this 
should be left until after I drill.

Any other issues that could be causing this?  I suppose the key is 
super sharp bits.  PS: I'm using a 20k RPM 'dremel' like tool and non-
tc drill bits (yet).  Have yet to find a source for them in Australia.

Adam