wallpaper paste
{{Short description|Adhesive material}}
file:Wallpaper paste flakes.JPG
Wallpaper adhesive or wallpaper paste is a specific adhesive, based on modified starch, methylcellulose, or clay{{cite web |title=Wallpaper Adhesives |url=http://www.wallpaperinstaller.com/adhesives.html |url-status=live |archive-url=https://web.archive.org/web/20231205022034/http://wallpaperinstaller.com/adhesives.html |archive-date=2023-12-05 |work=wallpaperinstaller.com}} which is used to fix wallpaper to walls.{{Cite web |date=2016-06-06 |title=How to Activate Wallpaper Paste |url=http://www.dummies.com/home-garden/walls-ceilings/how-to-activate-wallpaper-paste/ |url-status=live |archive-url=https://web.archive.org/web/20220325023854/https://www.dummies.com/article/home-auto-hobbies/home-improvement-appliances/walls-painting/how-to-activate-wallpaper-paste-190744/ |archive-date=2022-03-25 |access-date=2024-07-06 |website=dummies}}
Wallpaper pastes have a typical shear thinning viscosity and a high wet adhesive tack.{{Citation needed|date=December 2019|reason=removed citation to predatory publisher content}} These properties are needed to slow down the penetration of the adhesive into the paper and wall, and give slow bonding speed which gives the wallpaper hanger time to line up the wallpaper correctly on the wall. The adhesive is usually sold in pouches or boxes as flakes that are mixed with water to produce the paste. It is also available ready mixed in tubs.
The wallpaper adhesive is applied to the wallpaper to let the moisture of the adhesive soak into and penetrate the paper. The paper will thus expand before hanging rather than on the wall, which would cause vertical bubbles in each panel of wallpaper as the adhesive dried from the edges in.[http://www.homedepot.com/catalog/pdfImages/b4/b4fe1fc8-f032-4003-9159-40584bcea489.pdf Homedepot Graham & Brown Wallpaper FAQ] When using a type of wallpaper paper that does not expand, such as nonwoven or fiberglass wallpaper, the adhesive is applied to the wall instead.