Thinning down vinyl matt emulsion

[Adam78]

Hi,

Can I thin out some vinyl matt emulsion paint with water to paint a first coat over some new lining paper?

The paper is quite absorbent so I was thinking maybe water down the paint for the first coat?

what ratio to water down?

Any advise appreciated?

 

[Bonni]

10%, so 1 litre to 10 litre of emulsion.