Tag Archives: What does ‘sizing’ mean?

Wallpapering On New Bare Plaster Walls or Ceilings?

Wallpapering On New Bare Plaster Walls or Ceilings?

As explained in this post applying size to a wall or ceiling prior to papering prevents wallpaper shrinkage. This avoids the horrid gaps that can appear between each hung length once the paste has dried.

With new plaster the shrinkage problem increases because new plaster will suck the life out of wallpaper if the plaster isn’t sealed before doing anything with it.

So, you have your new bare plaster wall or ceiling. It needs to be sealed using either a sloppy mix of Dulux Supermatt or a solution of bog standard white matt paint with water added to make it sloppy – more detail in this post.

Paint your sloppy solution all over your new plaster.

You will notice that the sloppy solution dries incredibly quickly on the new plaster. That is because the plaster has sucked all the moisture out of the sloppy solution. Exactly what it would do to your lovely wallpaper, resulting in an awful finish.

Once dry, paint on another coat of the sloppy solution.

Allow to dry overnight.

Next day, apply wallpaper size to the wall.

Again, allow to dry overnight.

Your newly plastered walls or ceilings are now prepped and ready for wallpaper.

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Gap Between Each Length of Hung Wallpaper!

Gap Between Each Length of Hung Wallpaper!

So, you have bought your favourite paper and hung it on the wall using a quality brand of wallpaper paste.

You allowed each length of wallpaper its proper soaking time after applying the paste, before hanging on the wall.

You met the edges of each length together with the next to create the best end result.

It looks fantastic.

And yet…..

The next day, when the wallpaper paste has dried, there are gaps of a couple of millimetres between each hung length! Oh, the horror!

Why does this happen?

If you hang wallpaper on unprepared walls or ceilings, the walls and ceilings will suck all the moisture out of the wallpaper and paste.

This causes the paper to shrink and results in the gap between hung lengths.

How can I prevent this from happening?

Prevention is very simple.

On everything except new plaster, so on previously painted or papered walls, an application of size is required.

Size is a runnier version of wallpaper paste which you can buy in sachets from all good DIY shops – it will be right next to the packets of wallpaper paste. As with wallpaper paste it does not cost much but in terms of how your wallpaper will look at the end of the project it’s priceless!

Mix the size powder with the appropriate amount of water and paste it onto the wall or ceiling you intend to paper.

Leave overnight to dry.

This will give you time to plan the wallpapering project ahead so don’t think of it as wasted time when all you want to do is get the job done.

On the contrary, consider the size time as THE most important part of the job.

Next day….

Apply your paper, butting your edges against each other.

You will notice that with walls that have been sized, you are able to slip and slide your length of pasted wallpaper into position more easily.

Upon drying you will not have gaps between each hung length of paper. Unless you left a gap of course!

Job well done.

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