The best, most readily available product for this is Gardz.
I know you'll find other products on their web site specifically
designed for wallpaper prep. But take it from one that has been the
business for nearly 30 years. This is the way to go.
It will also make removal easy when you want to change it.
I have associates that have had failures with Sheildz.
I've used it & never will again.
sanatist,? I assume you mean Sanitas. Which leads me to think you'll
be using a prepasted wallcovering.
Many prepasteds don't have enough adhesive on them. You may want to
add a bit of premixed clear to your water & roll it on instead of
using a water tray.
You'll have to experiment.
Here's an informative link. And no I'm not in any way affiliated with
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