How can I completely cover a spot?

Apply concealer to the area and then blend out using a tapping motion with middle finger.  Avoid a wiping motion as this will merely remove what you’ve just applied. 

If the your still seeing spot nice and shinny, dip a thin eye liner brush into a thick concealer and apply it to the centre and stipple over the area using the brush until it is hidden. 

Take a damp cotton bud or cotton bud with a little moisuturiser and wipe any excess over the good skin.

Then dip a small briush or powder puff over some loose powder and lock in the conceler! Simple!