On Friday, April 6, 2018 at 5:04:03 PM UTC-4, Electric Comet wrote:
i had come across some ply that i had not seen before

the stuff i had was formerly a display

it is very stiff and is 7 ply

well i just happened to come across it
it is sold as underlayment and has nailing guides on it or maybe they are
tiling guides on one side

it looks like the marks are just ink sprayed on and look like they could
be sanded off

the sheets i saw were four by five

Is there some reason that you are not telling us where you "came across it"?

Why share that story if you're not going to share the source of the material
or a picture or a link or the name of the product?