Polyurea has a big family, where there is spray polyurea, hand brushable polyurea, single component polyurea, two components polyurea…etc., if you feel complicated with those different types, this article will give you some information, and help you choose the most suitable polyurea system for your jobs.

What is brushable polyurea?

The most common polyurea we know is spray polyurea. But as the development of polyurea technology, spray polyurea cannot meet all the different applications, especially in small area, repairing work, or where it’s not convenient to bring a big spray machine.

So that the chemist also developed brushable polyurea, such as single component brushable polyurea, two component brushable polyurea, and polyaspartic polyurea.

These formulations use low activity system, which reduced the reaction time of isocyanate and resin a lot, so that can allow to apply by hand.

What is the category of brushable polyurea?

According to the reaction method, there is single component brushable polyurea, and two components brushable polyurea.

Both single component brushable polyurea and two components brushable polyurea can be transparent, while spray polyurea cannot, so we can use this kind of material to do waterproofing on wood, ceramic or anywhere we don’t wat to change the original color of the substate.

Single component brushable polyurea is isocyanate react with special amine terminated hardener, which need the moisture to participate in the reaction.

The advantage of single component brushable polyurea is that it can be used directly without weight or mixing, but the disadvantage is that it’s usually has little solvent inside, in order to make the viscosity lower.

And because of the reaction method, we should better used single component polyurea as soon as possible once we open it.

There is also aromatic single component polyurea and aliphatic single component polyurea, the difference is the aliphatic is color stable when exposure to the UV, and the cure time of aliphatic single component brushale polyurea is slower than aromatic single component.

Two components brushable polyurea is low activity isocyanate react with amine terminated polyether, there are also aromatic and aliphatic brushable polyurea (polyaspartic polyurea).

The reaction time of two components aromatic polyurea is quicker than two components aliphatic brushable polyurea (polyaspartic polyurea), so that polyaspartic polyurea is much easier to operation.

Two components brushable polyurea is easy to be stored, and it’s allowed to add pigment by customers, by adding pigment into the B side.

The advantage of two components polyurea is that it’s usually solvent free, which is environment friendly, but the disadvantage is that we need to weight and mixed before use, so that the operation skill will influence on the properties of the materials.

What is the difference between spray polyurea and brushable polyurea?

The reaction of spray polyurea is very fast, it’s usually within serval seconds, so that it can only apply with special high pressure and high temperature machine.

And because of the reaction method of the machine, which we called “impingement reaction” ， even we didn’t add pigment into the B side, spray polyurea cannot be transparent, because there are so many tiny little bubbles inside the coatings.

But if we don’t add pigment into brushable polyurea, it can be transparent, so that we can use for where a clear waterproofing coating is needed.

We also cannot get a smooth surface by spraying polyurea for big area, because the fog goes everywhere will make particles, but we can get smooth surface by applying hand braushable polyurea, because it’s low reaction and has time for levelling.

The advantage of fast reaction spray polyurea is that it can be sprayed on vertical surface without sagging.

By the formulation design, the brushable polyurea can get similar or even better physical property as spray polyurea, but because of the low reaction, it cannot apply thick thickness in one path, so it’s low efficient compared to spray polyurea.

But we cannot bring a big spray machine to everywhere, so that for small area waterproofing, such as a small roof, or repairing job, or field area where don’t have electricity, hand brushable polyurea is very good to use.

What is the difference between hand brushable polyurea and hand brushable polyurethane?

First, we should know that the raw material of polyurethane is cheaper than polyurea, no matter it’s spray polyurea VS spray polyurea, or hand brushable polyurea vs hand brushable polyurea.

Hand brushable polyurea has better physical properties, such as high tensile strength and elongation at break, and more stable to the moisture, and it is more durable material for waterproofing than polyurethane.

Unfortunately, there is polyurethane pretend to be polyurea in the market, we should identify carefully.

How to choose hand brushable polyurea?

We can’t tell which is better without considering the application condition, we only choose the most suitable material for the application.

As we know the difference between spray polyurea and brushable polyurea, as well as the difference between single component brushable polyurea and two components brushable polyurea, we can choose the most suitable one for our jobs.

And as a professional manufacture of polyurea, we can also give you suggestion, that why we offence ask a lot of questions before sale, polyurea is a technology not a simple material, we will give you whole support.

How to apply brushable polyurea?

First, in order to get a better adhesion, we should do the surface preparation for different substate, and it’s similar to spray polyurea.

For the concrete, we should remove the dust, and apply primer, if there are too many pinholes, it’s also suggested to apply putty, in order to reduce the consumption of polyurea and save money.

For the steel substate, we should sand blast or grind the surface first, and apply suitable primer, in order to get good adhesion.

For other substate, we also have some special agent, just use this agent wipe the surface, so that we can easily get good adhesion, you can feel free to contact our technician for further help.