After @StevieRayFan showed us what he used to darken a fretboard I knew exactly the guitar I wanted to try it on. This is my cheap Fender DG-7 I've had 20 plus years and it has always had a faded fretboard on the upper frets. It would look better after I would clean it with Lem Oil but would soon got back to this chalky color. It's the guitar I play the most and even so I didn't have many photos of the fretboard but I did find one to compare it the darkening too. This is one coat after its been drying for about an hour. Looks promising. Thanks again for posting the idea @StevieRayFan .