I am wanting to buy interior paint in satin to cover varnished skirtings and doors on a staircase , which is the best one to use. Can you advise me. Thankyou.
Assuming the varnished substrate is clean, dry, sound and prepared as detailed in the Technical Data Sheet we can recommend Zinsser B-I-N followed by Zinsser Perma-White Interior.
This is available in many RAL and BS colours in a matt or satin finish.