Hello.
I have a wall in the basement at home that is plastered and painted white. However, it's a bit "pizzeria-like" and I would like a smooth concrete wall. I suspect it is painted with silicate paint.
Now I wonder two things.
1. How do you find out if it's silicate paint on the wall?
2. If it is, can you plaster directly on top of it, or does the paint need to be stripped first?
/Gunnar
I have a wall in the basement at home that is plastered and painted white. However, it's a bit "pizzeria-like" and I would like a smooth concrete wall. I suspect it is painted with silicate paint.
Now I wonder two things.
1. How do you find out if it's silicate paint on the wall?
2. If it is, can you plaster directly on top of it, or does the paint need to be stripped first?
/Gunnar
Don't know if it's possible to plaster on silicate or not, but from what I've heard, it's not possible to lime on silicate, which might indicate that the plaster might not adhere well either.
Silicate is matte and in appearance very similar to a limed wall.
Tompa
Silicate is matte and in appearance very similar to a limed wall.
Tompa
Test if it's silicate paint: Silicate paint is firmly bonded, cannot be scraped off, does not get wet, and is completely matte. If you can scrape off a little paint, you can try to burn it. Silicate does not burn, but plastic-based wall paints do and smell accordingly.
It is difficult to plaster on surfaces that do not absorb water, but there is surely some filler that can adhere to painted surfaces... However, it is a risky measure because it is in a basement. If you have moisture migration that you do not notice now (because it is silicate paint that breathes), you will encounter problems when you seal the breathing surface. The safest and most laborious method is to remove the painted plaster and plaster smoothly + repaint. The easiest but most uncertain method is to fill and paint... :-/.
Wonder if you can remove paint and texture with a fast-going tool? Maybe someone has done it and can tell more...
gaia
It is difficult to plaster on surfaces that do not absorb water, but there is surely some filler that can adhere to painted surfaces... However, it is a risky measure because it is in a basement. If you have moisture migration that you do not notice now (because it is silicate paint that breathes), you will encounter problems when you seal the breathing surface. The safest and most laborious method is to remove the painted plaster and plaster smoothly + repaint. The easiest but most uncertain method is to fill and paint... :-/.
Wonder if you can remove paint and texture with a fast-going tool? Maybe someone has done it and can tell more...
gaia
Member
· Västra Götaland
· 545 posts
If it is silicate paint you can test as "gaia" suggests... but it is not always completely matte and not always odorless when you fire it. The silicate paint from our big "dragons" in the paint industry, as far as I know, has silicate paint that is borderline plastic paint due to high amounts of "polymer."
Perform another test by wetting the surface, preferably with a little soap/dishwashing liquid. If the surface becomes soft, it is probably a plastic paint (if you like, you can also try paint removal; if it doesn't resolve it, then it is silicate paint).
If you have now tried to soften the paint without the result being a soft, gooey paint, you can plaster with gypsum plaster... like gypsum. An alternative is an organic plaster mortar like maxit serpo 261 plaster mortar EF or for example STO Faserputs (There are many variants here).
Good luck!
Perform another test by wetting the surface, preferably with a little soap/dishwashing liquid. If the surface becomes soft, it is probably a plastic paint (if you like, you can also try paint removal; if it doesn't resolve it, then it is silicate paint).
If you have now tried to soften the paint without the result being a soft, gooey paint, you can plaster with gypsum plaster... like gypsum. An alternative is an organic plaster mortar like maxit serpo 261 plaster mortar EF or for example STO Faserputs (There are many variants here).
Good luck!
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