I was woodworking today and had to change the drill collar and the height of the jig. With sawdust on the jig and only impressions for numbers and lines, it was hard to see. I was wondering how I might be able to correct this. Then an idea came to me.
I remembered back in my high school days when I would play Dungeons & Dragons. Yeah, I know, but I grew out of it... Anyway, the game came with multi-faceted dice made of plastic. However, the numbers were carved out of the plastic, much like the Kreg Jig.
The trick we'd use to see the numbers on the dice was to find a crayon of a contrasting color. Take the crayon and rub the wax across the numbers until the little grooves are full of crayon color. When you feel satisfied with the fill, take a paper towel and rub off the excess. This will take a while, but the result is perfectly readible measurements and calibration lines. I'll post pics of this result soon.
Here is that photo I was talking about.