Its a 3M product called velstik

Try smooth-on.com
They have some 2 part urethanes that are pourable and will accept staples

check out this website
https://www.hydesleather.com/show-n-tell/client/emory-motorsports

Sort of a different thing but we once found a snake inside a seat.
Johann
www.coachtrim.com

before you lift the foot with needle down, crank the hand wheel forward so the needle comes up almost out of material, then lift foot and turn your corner
Johann
www.coachtrim.com