Kitsie ... glad you have found something that works.
I tried Press 'N Seal when I first started quilting, but it always seemed I wanted a bigger audition window.
A clear piece of plastic/vinyl solved that problem.
(the type that some use to cover their tablecloths on a table).
I had never used Press 'N Seal til I started quilting.
Then I found what seemed easier to work with ... and now use a sheet of plastic/vinyl.
(the type that people use to cover their tablecloths on the table)
I lay the quilt flat, and place the plastic over top.
Then draw on the plastic with a wipe away marker til I get it figured out.
The vinyl is heavy enough that I don't worry about the marker going through it and onto on the quilt.
If it takes a few tries, the marker wipes away easily enough until I figure out what I want.
The plastic lifts off and keeps the design in place, ready to put back on the quilt, if I need a refresher as I mark the quilt ... or come up with a new idea that I want to also try before I am done marking.
At the end, I wipe down the vinyl good to be sure there is no residual that might transfer the next time I use it.