The siloxane paints between good and bad

… never confuse hygroscopic paintings with the real cure against’moisture Wall.

siloxanesWhen you are dealing with paints for exterior wall, You must take into consideration two fundamental factors:

moisture, that acts in the form of water vapour through painting
atmospheric agents that is being constantly, that will result in the gradual deterioration.

Optimal characteristics for an outdoor painting must be breathability and waterproofness.

The films of Paint/painting often are subject to damping due to frost or loops for acid rain caused by the high presence of pollution, especially in large cities, that facilitate finishing layer disintegration and formation of mold, mosses and bacteria, affecting the facade cladding look worse.

But the rains are not the only problem, rising humidity also has great preponderance in the preservation of a facade; It, penetrating by flap water or to condensation, comes to create micro cracks, they often worsen over time, presenting bulges and secondments also abundant pictorial films or worse in plaster.

However, there are solutions on the market of paint, for their special feature, solve these two major problems stretching to much maintenance and conservation of exterior facades.

The siloxane paint is obtained by the polymerization of silica (SIO2) combined with other organic products or resins silicone-based depending on the production technology used or the specificity that you want from the product.

The result is a macromolecule that forms from inorganic mineral compounds that has a double property:
– a hydrophilic due to the mineral component (Silica)
– a water resistant due to the organic component.

Glaze painting is therefore a binder resin (Acrylic almost always) that gives the correct mechanical characteristic of adhesion and silicone resin which provides character of water repellency and water permeability to water vapor.

Aesthetically, siloxane products, a time dried, they occur, as a microporous material but that water repellent, on the one hand, allows the steam contained in the migration outward support, on the other hand prevents the raindrops and moisture to penetrate inside the masonry.

A sort of skin, vapour-permeable, the water coming from the outside, the microporosity is ensured by formation of a lattice, not present in common synthetic paints.

But I'm really all advantages?

idrorepellNow I know to go against current, and maybe I'll make some enemy, but I can't fail to devote part of this article to what I consider a major flaw in these paintings.
Despite all the talk that it is about journals, siloxane tints are not, in my opinion, the best and the only modern solution for construction painting.

Just their main strong point (the waterproofing), in some cases, turns in their most disappointing Achilles ' heel and it is obvious that manufacturers, even more so the only multinational company which manufactures silicone resins for paints silossanice, have no interest in showing the weaknesses of the product.
Even in magazines, whenever we speak of silicone resins in painting, If you settle with great emphasis all advantages (Although actually there are), without ever mentioning any flaws; to be honest I've never found an article that did, No matter what the brand or type of paint treated.
In addition, What I create huge distrust, is the fact that almost all items drawn on siloxanes, I've always looked after by Wacker Chemie and other manufacturers of silicone resins, It will be a case?
Wanting to do a special analysis until recently, wasn't even easy to find a technical description and chemistry of siloxane resin, because it was a formulation nearly obscure and little known even to retailers, so much so that often, even today, the siloxane paint is sold as a close relative of silicate paint, even for the same silicate.

Since however I would like to feel more possible super partes, I prefer list always pros and cons of any product that I'm going to review and I must do that not even this time.

For an unfortunate personal experience, I found out that, in certain situations and conditions, many of the positive features of the siloxane paint not only cancel, but indeed become very showy flaws.
For example, in the presence of high humidity inside the wall fabric, resin crosslinked structure which allows the passage of steam, turns into a real trap: the water inside the wall can no longer dating, Why is facing a difficult barrier to cross. Therefore l’plaster begins to crumble in no time and color film crumbles because raised by saltpetre that inevitably form below it.

Recent studies and experiments carried out in the Valley of the temples in Sicily, In addition, proved that the waterproofing effect of siloxane resins does not last for a long time, requiring continuous and repeated maintenance.


Although this type of resin is not attacked by mold, in the presence of pollens, spore and lichens, oxalates which easily generates (Although by their nature are not harmful), in large quantities can be unsightly as they present themselves as a haze throughout the painting or as small dark spots expressed in different forms varies in colour from greenish to gray.

You Must, Therefore, choose very well on what use this wall painting. In other words, the product is certainly valid for its ease of use and its peculiar quality, but works well only in certain conditions.the wall's.
Avoid damp or walls where there are inner tubes, because in case of breakage could ruin the entire pictorial cover ’.
Another sore point is that this kind of hue has a very high market price, sometimes even superior to silicates, unapproachable from non-professional course.

Advantages and disadvantages of siloxane paints

– Very easy application, similar to washable paints.
– Light fastness.
– Good resistance to atmospheric agents.
– Breathability from inside to outside and external waterproofing.
– Good abrasion resistance.

– Very expensive and few colors available in small doses.
– The solid layer may become detached from the background if it contains a high percentage of water moisture.
– Browse easily if misapplied or not used properly.
– Its positive qualities manifest themselves only in limited conditions.


   ———-        taken from a fine article by Mario Arnaldi da Arte, Materials and techniques


The difference between Silicate paint paints and siloxane are actually very evident and marked.
Who tends to equate he does not know anything about their chemical nature or the differences that offer application, the appearance and durability.

With the nomenclature silicate means substances and solutions Salt silicic some distinctly alkaline metals (Lithium type, Sodium, Potassium etc.) and they are used in various industrial sectors starting from detergents up to the processing and extraction of petroleum substances.

In the building sector, products made with binder silicate (paintings, consolidanti, mortars or coatings) have chemical nature entirely mineral (and they are usually made of potassium silicate).
This binder, which it is totally inorganic, It reacts chemically with the same binding support intimately (process of silicizzazione), this bond does not create a surface film (organic or synthetic) and totally leaves unaltered the physical properties of the same support, consequently also remain unchanged all the properties of the material (porosity, water vapor permeability, weathering resistance, etc).

When applied properly, silicates, allow the realization of very high aesthetic value finishes, with uniform coverage, matt appearance and a deep penetration and antichizzata.
For the strongly alkaline nature and the total inorganicità, such treatments are practically unaffected by molds, mosses and bacteria, also for the characteristic deep adhesion (almost molecular), not browsing and remain highly stable in color even if used under extreme and particularly aggressive environmental conditions.

The high product quality is guaranteed by law: according to the latest DIN 18363, The silicate-based products can contain a maximum of 5% of organic substances added to the total.

Needless then make comparisons with all other kinds of paintings (including siloxane), only the silicate paints allow an excellent finish without adding films and limit the masonry perspiration.
The high cost is therefore justified from superb chemical-physical characteristics and great durability.

Let us therefore warn all citizens that many traders and unscrupulous practitioners, taking advantage of the similarity in terms (and ignorance of the less experienced), offer much poorer paintings to the price of real silicates, so watch out for scams!


For those damp walls or placed in damp and rainy harsh environments, paint on the exterior can then be very expensive and poor durability.
It serves first resolve all the boundary moisture problems and mold, Then apply the paint; because the shielding features added from the painting will go to worsen the walls to breathe and reduce the hours of work just done.

For this service the most suitable product, eco-friendly, quickly and safely is without any doubt IgroDry 2301 because it heals the masonry inside and restores the original breathable been.
For today is also the single most innovative product able to heal from moisture and mold with ease and speed, all types of masonry.
For those who need clarifications may write the Contact a representative for opinion always open and free.
For those who want to learn more on the results can be evaluated what others say independent rapporteurs they have tried.
For those who want to learn more about the product, here main benefits, here features, In addition what does he do and How do I use.

Other news, information and opinions are accessible from bar the menu at the top black / orange.