How to Hang Unpasted Wallpaper
Unpasted wallpaper means pasting the paper and there are a few tricks to getting a well behaving wallpaper once you've put the paste on.
Unpasted wallpapers require the application of wallpaper paste generally to the wallpaper backing. In this case the backing is a “paper” and requires glue application to it, to assist softening of the wallpaper. Read the label of your wallpaper to ensure this is the correct method of paste application. Other unpasted wallpapers can be installed by pasting the wall surface. Ensure you check this important instruction.
Preparation of the wall remains exactly the same as when hanging any wallpaper the traditional way. Preparation is the most important part that can make or break the finished job.
1. remove old wallpaper
2. walls must be clean and dry, sealed and cured
3. if necessary, prime with a pigmented sealer (Zinsser Shieldz) on very porous unpainted surfaces such as gyprock, or over old firm wallpaper that is impossible to remove.
4. cement render surfaces will require a lining paper as a base to overcome the rough texture and ensure good adhesion.
5. sandpaper, dust and apply glue size before hanging wallcoverings allowing to dry thoroughly
6. painted surfaces, in particular gloss enamel, should be washed with sugar soap and rinsed then sanded with an 80 grit sandpaper. Dust and size*
*Size can be made up by making up a weaker solution of glue (Metylan or Bartoline Powder) or it can be provided as a latex size (Superbond Latex). It is an important step in wall prep to enable adequate adhesion, ease of application and then later removal of wallpapers.
PREPARING METYLAN PASTE
1. use only Metylan Paste when applying non woven backed or paper backed wallcoverings. Crockers also have another suitable glue: Bartoline Powder for smaller jobs.
2. sprinkle the contents of one packet of Metylan (200gms) gradually into 4 litres of cold water whilst stirring firmly (use an old egg whisk!). Repeat after approx 3 mins and beat well after about 25-30 minutes. The paste is now ready for use.
3. one packet of Metylan is sufficient for approx 4-5 rolls of wallpaper pending how much moisture the wall will absorb.
HANGING “UNPASTED” WALLPAPER
1. apply paste directly to the back of the wallpaper with a medium nap roller or wide brush. Using a roller will be faster, however ensure you brush well glue along edges and seams.
2. paste your first drop and allow it to “rest” or to “book”. Some wallcoverings can have the pasted sides folded loosely together. This will allow the paste to soak in (booking) and hence the wallpaper to relax. This helps eliminate the problem of air bubbles and also seam shrinkage. Some metallic wallpapers should not be creased (particularly darker colours) as they can become damaged and this will be easily seen once on the wall. It is best to allow these papers to relax on a table with pasted side facing up and laying flat.
3. apply the wallcovering drop onto the wall leaving approx 5cm extra on top and bottom for trimming. When positioned correctly, smooth out from the centre to the edges using a wallpaper laybrush or smoother, removing any air bubbles. Ensure edges/seams are stuck firmly to the wall. Run a pasted brush down the seam if needed. Do not use a seam roller. This can damage and flatten the pattern making seams more prominent. Take care if a seam roller is needed (only for smoother patterns)
4. trim off excess wallpaper and rinse away any excess glue left on skirting boards and ceiling cornices.
5. before cutting your next drop, check the pattern repeat by aligning against the drop already hung and then cutting accordingly. Some wallpapers will have no repeat, so check the label concerning the design. The pattern repeat can also be matched prior to hanging by laying drops side by side and finding the design repeat this way before hanging the first drop.
6. if any areas need to be overlapped e.g in corners then a ready mixed border adhesive will be required to adequately secure these edges. Overlapping however is not always required and not recommended unless in an inconspicuous area e.g behind doors or in a dark corner.
NB: PLEASE NOTE IF PROBLEMS OCCUR OR THERE IS A FAULT WITH THE WALLPAPER DESIGN, THEN DO NOT PROCEED WITH THE JOB. CONTACT YOUR RETAILER FOR FURTHER ADVICE AND INSTRUCTIONS.
LIABILITY WILL NOT EXCEED ROLL REPLACEMENT IF PROVED FAULTY. LABOUR CLAIMS WILL NOT BE ACCEPTED, AND WE HAVE NO CONTROL OVER SURFACES USED OR HANGING PROCEDURES.
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