In our technical datasheets the theoretical efficiency is given in number of m2/L. When it comes to spray application, the real efficiency is about 60% of the theoretical value. For brush and roller application the real efficiency is about 90% of the theoretical value.
As an example, our Briosil primer 6/7360P has a theoretical efficiency of 8 m2/L. The real efficiency then becomes (8 x 0,6 =) 4,8 m2/L. For spray and roller application the real efficiency becomes (8 x 0,9 = 7,2) m2/L .