What is this material?

[BR1992]

Hi all,
Doing some much needed DIY (will bond then skim it) as some paint/backing is peeling. Could anyone advise what the rubbery/leathery type material is that’s peeling off?

 

[smoother09]

Kryptonite! Be careful.

 

[The Hobo]

Hi all,
Doing some much needed DIY (will bond then skim it) as some paint/backing is peeling. Could anyone advise what the rubbery/leathery type material is that’s peeling off?

its felt based probably keeping a damp issue dry

 

[bobski]

Hi all,
Doing some much needed DIY (will bond then skim it) as some paint/backing is peeling. Could anyone advise what the rubbery/leathery type material is that’s peeling off?

Looks like polytex or polyripple