What sort of paint is this?

I have painted the walls with dulux walls and ceilings paint. They then bubbled and peeled. Have scraped away the peeled paint but found this later underneath. I am just wondering if anyone knows what it is? As it’s very hard but if you peel it a bit harder it comes off a rubbery type of paint and has more paint... show more I have painted the walls with dulux walls and ceilings paint. They then bubbled and peeled. Have scraped away the peeled paint but found this later underneath. I am just wondering if anyone knows what it is? As it’s very hard but if you peel it a bit harder it comes off a rubbery type of paint and has more paint underneath it up until the plaster. Can someone please help me out by telling me what it is haha thankyou!
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