Desk Bare Spots

Used BeautiTone Wood Shield Best Deck Stain 5 years ago (refer to photo for this product).  Pressure washed and recoated it 2 years ago using a paint sprayer.  Incurred no problems, looked great.  Now 2 years later I have a few bare spots where it has peeled off.  This area gets direct sunlight.  I lightly sanded it using 240 grit sand paper, then cleaned that small test area.  I wanted to only do a small test area first to see if my logic worked.  I applied 2 coats on this bare area using a paint brush, waiting 24 hours until I applied the second coat.

My problem is that this bare area hardly changed color at all.  It basically still looks bare with a very light coating of deck stain that looks more like transparent which this color is not.  So after my 2 coats I went back to the hardware store and had them mix my can using their machine.  I then tried another small bare spot area using the same procedure as above.  Same problem, the colored stain barely covers that bare spot.  Any suggestions please.