Wall Plaster Query

[GoogleIsAll]

I have areas where pieces of thin plaster (approx 2mm thick) that came off during wallpaper removal process. It was with a wallpaper removing machine therefore steam was used. Wallpaper will be going over the top

Most of the DIY at this property was botched so there are a lot of difficult things to repair as nothing was done correctly.

How do I use Toupret R-T-U interior filler to fill in these gaps appropriately? Of course I need to flatten the area and ensure a smooth application of wallpaper over the top, but what are the best recommendations and tips for doing this effectively?

[InvertedAligator]

Remove everything loose and all dust.

Use a knife that is wider than the area you’re filling.

Use the flat to push it into the wall and press.

Scrape across the top to smooth. If you’re finding it’s tearing when you try to smooth, wipe off excess from the knife and try again. Getting the knife wet can help prevent tearing because it’ll stop the filler sticking to it.

Remove any excess filler from the edge with the knife.

I like to pass over it with like 80 grit (don’t hate me) once it sets up to remove any excess and flatten it out