prepaste
verb
pre·paste ˌprē-ˈpāst 
variants or pre-paste
prepasted or pre-pasted; prepasting or pre-pasting
transitive + intransitive
: to apply paste or adhesive to (something, especially wallpaper) in advance
But don't be tempted to prepaste more than two sheets at a time. The moisture in the adhesive actually expands the paper.
Niall Toner
Niall Toner prepasted adjective
or pre-pasted
purchased prepasted wallpaper
Word History
First Known Use
1857, in the meaning defined above