Great Wallpaper Starts With Proper Wall Preparation
The wallpaper may be the star, but the wall underneath determines how polished the installation looks and how well the wallcovering performs.
Wallpaper does not hide every imperfection. Bumps, loose paint, torn drywall paper, residue and heavy texture can remain visible beneath the finished surface or interfere with adhesion. Proper preparation creates a clean, dry, smooth and stable foundation.
The exact process depends on the wall condition, wallpaper material, adhesive system and manufacturer instructions. Use this guide to understand the major steps, then confirm the final primer and adhesive choices for your specific wallcovering.
Step 1: Inspect the Wall
Look closely at the entire area in normal lighting. Identify:
-
Nail holes and dents
-
Cracks
-
Raised drywall seams
-
Peeling or flaking paint
-
Torn drywall paper
-
Water stains or active moisture
-
Mold or mildew
-
Grease, dust and residue
-
Existing wallpaper or adhesive
-
Heavy orange-peel, knockdown or other texture
-
Glossy or nonporous coatings
Do not cover an active water leak, damp wall or unresolved mold condition with wallpaper. The source must be corrected and the wall must be dry before preparation continues.
Step 2: Remove Existing Wallpaper and Adhesive
Whenever practical, old wallpaper should be removed before new wallpaper is installed. The wall must then be cleaned to remove remaining paste and loose material.
Installing over existing wallpaper can create unpredictable results because the old seams, texture, ink, coating or adhesive may affect the new installation. Some specialty situations may be evaluated differently by a professional, but a sound bare substrate is generally the preferred starting point.
Removal can expose damaged drywall, torn facing paper or uneven skim coating. Those conditions should be repaired before primer is applied.
Step 3: Clean the Surface
Walls collect dust, oils and residue even when they look clean. Graham & Brown recommends cleaning walls before hanging wallpaper, while York’s peel-and-stick instructions emphasize a clean, dry surface for adhesion.
Remove dust and cobwebs, then clean the wall using a method appropriate for the existing coating. Kitchens may require extra attention to airborne grease. Allow the surface to dry completely.
Avoid leaving cleaner residue on the wall. The final surface should be clean, dry and free from anything that could interfere with primer, paste or pressure-sensitive adhesive.
Step 4: Repair Cracks, Holes and Damaged Drywall
Fill nail holes, dents and cracks with a suitable repair compound. Larger damage, torn drywall paper or widespread unevenness may require professional drywall repair or skim coating.
Allow repairs to dry fully, then sand them smooth. Run your hand over the wall and inspect it from the side. If you can feel a ridge or bump, it may remain visible beneath a smooth or reflective wallpaper.
Powdery compound must be removed before priming. Vacuum or wipe away sanding dust without saturating the repaired area.
Step 5: Address Wall Texture
Smooth walls produce the cleanest wallpaper finish. Heavy texture reduces the contact area for adhesive and can telegraph through the wallpaper.
Depending on the texture and selected product, preparation may involve:
-
Sanding minor high points
-
Skim coating the wall
-
Sanding the skim coat smooth
-
Applying the appropriate primer
-
Using a wall liner when recommended
Peel-and-stick wallpaper manufacturers commonly specify smooth surfaces. York notes that its peel-and-stick product may not work on heavily textured walls.
Do not assume that a thick or dark wallpaper will conceal texture. Order a sample and have the surface evaluated before purchasing the full quantity.
Step 6: Check the Existing Paint
Existing paint should be firmly bonded to the wall. Scrape away loose or flaking areas and repair the surface before proceeding.
Glossy finishes may need to be dulled or prepared according to the primer manufacturer’s directions. New paint must be fully cured—not simply dry to the touch—before wallpaper is applied.
Cure times vary by paint and wallpaper product. York instructs customers to allow a minimum of four weeks before applying its peel-and-stick wallpaper to newly painted walls. For pasted wallpaper, consult the paint, primer, adhesive and wallcovering instructions.
Step 7: Prime for Wallpaper
Wallpaper primer is different from ordinary finish paint. A compatible wallcovering primer creates a more uniform surface, supports adhesion and can improve future removal.
The Wallcoverings Association states that new drywall should receive a wallcovering primer rather than relying only on a standard drywall primer. Porous surfaces may absorb paste too quickly, while sealed or glossy surfaces can create different adhesion challenges.
The correct primer depends on:
-
New drywall versus previously painted walls
-
Porous plaster or joint compound
-
Glossy or nonporous coatings
-
Existing stains
-
Wallpaper backing and weight
-
Adhesive type
-
Room conditions
Follow the primer manufacturer’s coverage and drying instructions. When in doubt, ask the wallpaper manufacturer or professional installer to specify the system.
What Is Sizing?
Sizing is a preparatory treatment traditionally used to control porosity and help wallpaper paste remain workable. Some modern installers and manufacturers use wallcovering primers, sizing products or a combination based on the substrate and paper.
Graham & Brown recommends sizing fresh plaster with a diluted paste solution before its paste-the-wall products. Other wallcoverings and adhesives may require a dedicated primer instead. Treat “size the wall” as a product-specific instruction, not a universal substitute for primer.
Step 8: Let Everything Dry
Repair compounds, skim coats, cleaning moisture, primer and paint must be allowed to dry or cure for the required time.
Rushing the sequence can trap moisture or weaken the wall system. The room should also be at the temperature and humidity conditions specified by the wallcovering and adhesive manufacturers.
Step 9: Inspect the Wallpaper Before Installation
Preparation also includes checking the product. Before cutting or hanging:
-
Confirm the pattern name and SKU
-
Verify the quantity
-
Check that all rolls share the same lot or run number
-
Inspect for visible printing defects
-
Read the installation instructions
-
Confirm the correct adhesive
-
Identify the repeat and match type
Do not cut every roll before inspecting the product and confirming the layout.
Preparation for Different Wallpaper Types
Peel-and-Stick Wallpaper
The wall should be especially smooth, clean, dry and fully cured. Test a sample on the actual paint and wall surface.
Pre-Pasted Wallpaper
Confirm the activation and booking instructions. The wall should be repaired, smooth and primed with a compatible wallcovering primer.
Unpasted and Paste-the-Wall Wallpaper
Use the specified adhesive and primer system. Specialty backings and heavier materials may require particular products.
Grasscloth and Natural Wallcoverings
Because natural materials can show surface irregularities and may be sensitive to staining, professional wall preparation and installation are strongly recommended.
Murals
A smooth, uniform wall is critical because a mural creates one continuous image. Repair and prime the complete wall so color and texture remain consistent beneath every panel.
When to Call a Professional
Professional preparation may be the best choice when the wall has:
-
Heavy texture
-
Multiple layers of old wallpaper
-
Extensive adhesive residue
-
Torn drywall paper
-
Water damage
-
Significant cracking
-
Uneven plaster
-
High or difficult access
-
A specialty wallcovering planned
A wallpaper installer can evaluate the wall, but major skim coating or drywall restoration may need to be completed by a drywall specialist before installation day.
Wall-Preparation Checklist
Before the wallpaper installer arrives, confirm that the walls are:
-
Structurally sound
-
Free from active moisture and mold
-
Free from loose wallpaper and adhesive
-
Clean and dry
-
Repaired and sanded smooth
-
Free from sanding dust
-
Properly primed
-
Fully dried or cured
-
Ready according to the wallpaper instructions
Ready for Wallpaper?
Once the surface is properly prepared, your chosen pattern can look its best. Explore That Wallpaper Girl’s curated wallpaper collections and use our Installer Network to connect with qualified professionals in your area.
Frequently Asked Questions About Wallpaper Preparation
Do I need to prime a painted wall before wallpapering?
A compatible wallcovering primer is generally recommended, but the correct preparation depends on the paint condition, sheen, wallpaper and adhesive. Follow the product system specified for the project.
Can wallpaper cover textured walls?
Texture may show through and can reduce adhesive contact. The wall may need sanding, skim coating, priming or a liner before wallpaper is installed.
How long should new paint cure before peel-and-stick wallpaper?
Follow the wallpaper manufacturer. York specifies a minimum of four weeks for its peel-and-stick products.
Can wallpaper go over old wallpaper?
Removal is usually the preferred approach because old seams, coatings and adhesive can affect the new installation. Have unusual conditions evaluated professionally.