Step 7: Drill the Remaining Holes
You're getting close. Heat the pieces gently one more time. Not so hot as to get rubbery, but hot enough to soften the spray glue. The patterns should peel off easily. Allow to cool and clean up any remaining glue with acetone on a rag (outside again). Hang the rag up outside to dry. Wadded up and thrown in a garbage can is inviting spontaneous combustion and a fire.