IPA: //ˈprɛpæstɪd//
KK: /ˈprɛpæstɪd/
Describing something that already has glue or adhesive applied, so it only needs water to be ready for use.
The prepasted wallpaper made it easy to decorate the room without any mess.
Prepasted → It is formed from "pre-" (meaning before) and "paste" (from Old French *paster*, meaning to spread or smear). The word "prepasted" refers to something that has been pasted or adhered beforehand.
Think of something that has been 'spread' ('paste') 'before' ('pre-') — that's why prepasted means it was already pasted.