In the waterproofing protection of building exteriors, concrete structures, and natural stones, coatings must not only effectively prevent liquid water from penetrating but also maintain the "breathability" of the walls to allow water vapor to escape. At the same time, they must possess long-lasting aging resistance on highly alkaline substrates. Although traditional waterproof coatings can provide short-term waterproofing, they often form a sealed membrane layer, resulting in the accumulation of internal moisture in the walls, leading to freeze-thaw damage or blistering and peeling of the coating. The solvent-free silane/silicone mixture BP9500 adopts a reactive hydrophobic mechanism, does not form a surface film layer, but changes the surface characteristics of the substrate's pore walls through chemical bonding, and combines long-term waterproofing and breathability. It can be used as a candidate solution for waterproofing treatment of highly alkaline mineral substrates, but it must be verified through systematic tests of dilution ratio, construction process, and substrate absorption rate.


Why do building waterproof coatings often fail in waterproofing or blister and peel off over time?


The dilution ratio was not adjusted according to the substrate's absorption capacity - the recommended ratio is 1:10 to 1:17. Inappropriate ratio selection affects the penetration depth and waterproofing effect.


The surface treatment of the substrate was not up to standard - loose layers were not cleaned, cracks (＞0.3mm) were not filled, and sufficient drying (at least 24 hours after rain) was not ensured.


The construction method was improper - single coat application was not saturated or a second brush was not used, resulting in incomplete soaking of the surface.


The use of alkaline chemical cleaners damaged the surface state of the substrate, affecting the chemical reaction between the silane and the substrate.


After construction, if the effective waterproofing effect was not achieved and then exposed to rain (requiring sunny weather for curing), it was damaged.


The unit area dosage was insufficient - there are significant differences in absorption rates of different substrates (0.2-2L/m²), and large-scale construction was carried out without conducting small-area tests first.


What conditions need to be confirmed before selection and construction?


Condition category Required information
Substrate type Concrete, natural stone, limestone, brick, mineral gypsum, etc.
Substrate condition Dryness (24 hours after rain/cleaned), presence of loose layers, crack situation (＞0.3mm needs to be filled)
Dilution ratio 1:10 to 1:17, depending on the substrate's absorption capacity
Silicone diluent selection Fat-based hydrocarbons (mineral oil), odorless isomeric alkanes or aromatic hydrocarbons
Construction method Flat brushing/roller/vertical fall/airless spray gun
Construction surface Vertical surfaces or surfaces with certain slopes
Environmental conditions Avoid using acidic or alkaline chemical cleaners
Recommended dosage reference


Substrate type Recommended dosage (L/m²) Dilution ratio suggestion
Cement, concrete 0.3-0.5 1:10-1:15
Gravel 0.4-0.6 1:10-1:15
Limestone 0.4-2.0 1:12-1:17
Mineral gypsum 0.6-0.8 1:10-1:15
Brick 0.6-1.2 1:10-1:12
Common Misconceptions


Solvent-free products can be used directly without dilution.
BP9500 is a 100% solid content product. Before use, it must be diluted in a ratio of 1:10 to 1:17, depending on the absorption capacity of the substrate.


Surface coating indicates effective waterproofing.
This product does not form a surface film layer; it achieves waterproofing by changing the surface properties of the substrate. The "lotus leaf effect" can only be observed after several hours.


Alkaline chemical cleaners can be used for substrate treatment.
Avoid using acidic or alkaline chemical cleaners to prevent damage to the chemical state of the substrate surface and affect the bonding reaction between the silane and the substrate.


One coat of application can achieve the best waterproofing effect.
It is recommended to use a second brush for secondary treatment to ensure complete immersion of the surface and obtain the best waterproofing effect.


The amount of any substrate is the same.
There is a significant difference in absorption rate among different substrates (0.2 - 2L/m²). It is recommended to conduct tests on a small area to determine the actual amount.


Recommended construction steps


Confirm the type of substrate and its absorption capacity, and conduct tests on the dilution ratio and amount in a small area.


Ensure the substrate is dry (24 hours after rain / 3 days after clean water cleaning on a sunny day), clean loose layers, and fill in cracks > 0.3mm.


Determine the dilution ratio based on the test results (1:10 to 1:17).


Choose appropriate construction tools (flat brush, roller, airless spray gun).


Apply until the surface is completely soaked, and use a second brush for secondary treatment to ensure saturation.


Avoid using acidic or alkaline chemical cleaners to treat the substrate.


FAQ


What is the dilution ratio of IOTA BP9500?
The usual dilution ratio is 1:10 to 1:17, depending on the absorption capacity of the substrate. It is recommended to test on a small area first.


Which substrates is this product suitable for?
It is suitable for porous materials, such as various types of concrete, natural or artificial stone, limestone, mineral gypsum, bricks, etc. It is especially suitable for highly alkaline substrates.


Why is it necessary to maintain the "breathability" of the wall?
This product does not form a surface film. It changes the surface characteristics of the substrate's pores through chemical bonding, allowing for water vapor exchange and preventing the accumulation of internal moisture in the wall, which could lead to freeze-thaw damage.


How long does it take for the waterproof effect to appear?
A few hours after applying it on neutral or alkaline substrates, a noticeable lotus leaf effect can be observed.


How to ensure the best construction effect?
Ensure the substrate is dry, clean, and free of loose layers; adjust the dilution ratio according to the substrate's absorption capacity; apply it until the surface is completely soaked; it is recommended to use a second brush; it is suggested to test on a small area first.