I haven't tried it on overhead sheets, but seems like it would be the same thing as a plastic sleeve.

The weirdest thing

These are the best things to buy for your wet-erase map needs

These things make it so much easier to have a working calendar, and it's great because they come in a variety of colors.

I love how they don't smear, so I can fill in the numbers of the month and then later on add things on it and my palm won't smear the marker

I bought these to use on my dry erase whiteboard calendar to mark the date and other important things I wouldn't want to wipe off easily

Otherwise great to write things down and not smudge off.

I also noticed that even though it's dry, hours later (or even the next day), the ink gets on my hand when I put my hand on the mat (but it doesn't get wiped off by my hand which is a good thing).

These things have worked wonderfully with my Chessex Role Playing Play Mat

Brighten things up with Expo transparency markers

Mainly for things that don't change month to month, like certain daily things, weekend plans, etc

They mark things good, real good.....

The positive thing about this is that you do not rub one thing off while writing something else

n’t work well for what I need