Serum for face - all over or just in troubled zones?

[Lottapianos]

I just bought some of the Pure and Simple serum for dehydrated skin from Superdrug, after I heard Sali Hughes raving about it just before Christmas. I'm not sure exactly how to use it though. I clean my face then add it to damp skin, rub in very lightly then leave to dry, then add moisturiser on top (very dry skin). Do I use it twice a day or just once? Should I just dot it on forehead, corners of eyes etc or cover whole face and neck in a thin layer?

Thanks

I am using Loreal Laser Renew serum and I apply it all over my face twice a day befoe my moisturiser.

Thanks MrsRogerSterling. Are you happy with your Loreal serum?

I'm using the Garnier Serum and Moisturiser combined, I think it's the Lift range. Smells lovely. However I can only use at night because if I put my foundation or even tinted moisturiser over, it rolls into little balls and sloughs off

Kinda like having leprosy. Not attractive.