Now that the primer is
dry thoroughly (Wait at least 24 hours) you can now apply the masking tape
over it. The masking tape should be applied right over the primer using
the lines you drew. Note: If you
tape over the unprimed surface of
the Drywall or the paint isn't dry enough the tape will pull the paper off
the Drywall. Next the application of the block texture (Knockdown).