I searched for photopolymers on printed circuit boards and I found they are epoxy or acrylic based. But how a liquid epoxy got polymerised on the plastic plate before it is directed to uv and it is than deeper polymerised to form an other shape ?

I think I have to ask about photopolymer plates for gravure . Do you wash them after uv exposure to remove remaining traces or does it form a complete shape to do your print ? Do they come soft and scratchable and do they very hard after the uv exposure ?