Glue paint - what is paint and must be removed

The two photos show the current situation on the ceiling. It is supposed to be distemper paint, which must be completely removed before applying the primer, according to the explanation from the paint specialist dealer I trust.

The photos show scratched plaster; the depressions must of course be filled.

Also visible are two different white areas:

- the already scratched area sits directly on the plaster and is very dusty when wiped over by hand.

- the raised white area is the distemper paint, which has already been treated with the sanding pole, but could not be completely removed (the 60-grit sanding sheet smeared, as did, and too often, the air filter of the sanding pole), which is why the distemper paint is now to be scraped off.

Craftsmen on site have different opinions:

1. scrape off the distemper paint, then remove the remaining white layer down to the plaster with the sanding pole, then apply primer.

or

2. scrape off the distemper paint, apply primer on the remaining white layer, because the remaining white layer is not distemper paint but filler.

My feeling is that everything white belongs to the distemper paint and must go; why would there be so much filler on the plaster?

Dear all-knowing forum, please help me find a final opinion.

I think the white under the paint is really gypsum filler, something like Knauf Rotband or similar. It could stay, it just needs to be stabilized with primer before painting.

By the way, why didn’t you just paint over with glue paint? That works.

By the way, why didn't you just paint over it with glue paint? That works.

Unfortunately, you are asking the right questions :mad: ;) I had read once that glue paint gets tired, but it would probably have been sensible.

I think the white beneath the paint is really gypsum filler, something like Knauf Rotband or similar. That could remain, it just needs to be stabilized with primer before painting.

If it is gypsum filler, how do I recognize where the glue paint ends and the gypsum filler begins, or when enough has been filled...?

Ultimately, not at all. Only if there are still remnants of the paint on the fully scraped off and sanded surface does that not jeopardize repainting. You can assume that what remains will also adhere well and the new paint will be able to adhere to it.

Ultimately, not at all. Only if there are still remnants of the paint on the completely scraped and sanded surface, this does not jeopardize the overpainting. You can assume that whatever remains will adhere well and the new paint will be able to stick to it.

Uncertainty makes me nervous :confused: The specialist dealer was insistent that the glue paint must come off. Anyway, tomorrow a craftsman will use an expensive agent to remove the paint; I hope it removes all the glue paint. Maybe I can convince the craftsman (all-rounder/restorer - comes from construction) to use a giraffe sander as well.