Which bases are suitable?
All mineral bases
How do I prepare the base? (for unplastered walls)
Stone walls of differing textures or raw coating concrete must be freed of dirt dust and loose pieces. When using plaster bases and renders the instructions from the manafacturers prevail
What do I do with different bases?
Differently absorbent bases can dry out differently! Bases made from bricks, lightweight perforated brick, chalk, sand and lightweight concrete stones should be well dampened previously and a mortar cement spray from mortal group PIIIa (mixed grain sized suggestion) applied by hand or with a plaster machine over the entire surface. Then, before continuing to apply the plaster leave to dry for at least two days (white colouration)
How long does it take to dry?
Chalk gets better with age! A chalk paint, or Klimasan-Mox, is already dry to the touch after a few hours, whereas a Chalk perlite plaster (base layer) should only be reworked after 3 weeks. High grade lime plaster is dried out after 24 hours depending on base, temperature and air humidity.
Can I use chalk fro exteriors and interiors?
Depending on the product (e.g. Klimasan-Antik, a thick layered chalk render complying with DIN18550-1) chalk is suitable for interiors and exteriors
As the end user can I apply all chalk products myself?
It depends on the skill of the „end user“, if they can apply the Klimasan Plasters or fillers (Klimasan-Mox) themselves
Can I decorate on chalk?
After the rubbing down/whitewashing of the base it is also possible to decorate again
I have found a crack in my wall!
A crack is not always a crack!
Hairline cracks up to around 1mm in chalk always pop up. Larger cracks should always be inspected by a professional.
What does the PH value mean exactly? And what is it good for?
The term pH derives from pondus Hydrogenii or potentia Pydrogenii (latin: pondus = weight, latin: potentia = strength, latin: Hygrogenium = hydrogen).
The pH value is a measure for the acidic (low) or alkaline (high) reaction or a water solution.
Briefly said the higher the pH value, the better!
Klimasan-Perlit plasters have a pH value of 12
On a high pH base organisms like mould fungi, bacteria or algae (on exteriors) cant grow well!
Gypsum, synthetic plasters or dispersions contrastingly are in the neutral area at 5-7 and are an optimal base and food source for mould!
Is it enough just to use a chalk paint against mould?
Just painting over it is not the solution!
That would just be a cosmetic treatment!
It is important to clear away the causes of mould (e.g. water droplets on locked surfaces = klimasan Mox) and/or create a thermal insulating and capillary active base (perlite plaster)
Is it enough to just use the anti-mould spray against mould?
No! Anti-mould spray is like the chalk paint: just using this is not the solution. Anti mould spray serves to kills mould and disinfect, afterwards a renovation must be undertaken
Why chalk and not gypsum?
Gypsum is not just neutral with a PH value of 5-7 but also had the bad feture of taking in water and storing it for a long time. If dypsum stays damp for a long time, it begins to rot. Gypsym has poor sorption behaviour (absorbing and letting out liquids). Chalk however has good sorption abilities!
Is there anything improtant to take not of during the application? Safety!!!!!!!!
Highly akaline products are corrosive in their fluid state, avoid skin and eye contact at all costs. Always refer to the safety data sheets!
Have stains on glass, wood, metal etc?
Splashes should be washed away immediately, as otherwise the respective places burn (corrode), careful coverage is always recommended! Clean the surfaces and tools with clean water
What ist he difference between natural paints and plasters compared tot he conventional ones?
Have a look at the incredients oft he respective products, just to see what is actually in it! Unfortinately it is that every plaster or paint manufacturer can call their products “mineral”, even when they only have up to 5% synthetic dispersion.
WIth chalk it is so that every manufacturer can write chalk on their product when it only contains 3% chalk!
A few examples of ingredients that convenyonal „normal“ pains and plasters can contain.