maviskw

This is what I did. You could even make two of them. Then you have a clean one to change to when you have to take the board somewhere and had forgoten to wash it.

My removable cover is fitted at one end and elasticized at the other end. I have also put some markings on it with a perma pen. It's handy to have inch markings from one end to the other. Not for accurate measurements but for knowing if you have enough or almost enough of what you are pressing.

I have also put an outline of a 12/5 in square. This helped me keep a bias edged square "honest" a few years ago, and I have used it since a few times.