I once worked on a similar text (the topic was vinyl flooring) where what appears to be the "Hochzug" on your website was called the "baseboard". Okay, it's not a "baseboard" in the sense that it's not an actual "board" - but it serves the same purpose as a baseboard, namely to protect the lower part of the wall -- and, of course, to provide a watertight seal along the edge of the floor.

By analogy, I imagine that the "Tiefzüge" are the horizontal surfaces, in other words, the part of the floor that people walk on. This would seem to fit the context.

Hochzüge = baseboard surfaces
Tiefzüge = horizontal surfaces

So your translation could look be something like this: "priming/primer coats/undercoats (- or whatever word you're using for "Voranstrichen"-) on baseboard and horizontal surfaces (on the floor)".