Silkat Rollputz (Keim Intact) over adhesive residues?

Hello forum,

I have bought an older apartment that I am now renovating. I have removed the wallpaper, underneath which a well-preserved plaster has appeared. Unfortunately, there are paste residues on it. On the internet, you read everywhere that you should wash off the paste residues if you plan to work with silicate paint or plaster afterwards.

However, the paste has penetrated quite deeply into the plaster. I have tried washing it off in spots, but it is simply not possible (within the time I have and with the nerves I have).

My plan was actually: to sand the wall with a wall and ceiling sander so that at least the superficial paste residues are removed. Then prime with Keim Fixaktiv silicate primer, then paint over with Keim Intact (a silicate slurry coating with additives such as defoamer), and then Keim Biosil.

Does anyone have experience with Keim Fixaktiv and Keim Intact over paste residues? If it works, would I regret it later?

Best regards

Has anyone had experience with Keim Fixaktiv and Keim Intact over paste residues? If that works, would I regret it later?

I have no experience with that. But I would point out that for a pure paint coat, more is needed than just "sanding it down quickly." You should have a properly smooth Q3, preferably Q4 surface. So at least sand and fill twice. Otherwise, you will regret it later. Alternatively, use painter's fleece. And don't fixate on silicate paint. I don't think it will bring you any advantages.