Head space

[Sammyk]

I have several wines in secondaries. They each have about 2 inches of head space. At what point do I leave no head space, filled to the top?

Still new "here"............

 

[Yooper]

You want to top up whenever you rack. Unless fermentation is causing it to foam up to the top, gently add the water/wine/juice that you're using to top up now.