The girl at the paint store gave me the wrong paint, I wanted 2 litres of ceiling white tinted spanish white, as I am topping up paint I already have to do a second coat but they gave me acrylic low sheen tinted spanish white instead, unfortunately the store is now closed and doesn't open sundays (the only day I have time to paint).
Does it matter if I mix the two paints, or is it a disaster waiting to happen?