There are many different formulas on the market that provide spectacular industrial coatings. This includes polyurethane, pure polyurea, modified polyurea, primer, and aliphatic lining systems. All of these have the benefits, depending on the industry and type of coating needed.
Polyurethane coatings are highly resistant against water, salts, aggressive chemicals, and abrasion. The coatings are fast drying and curing, making them able to be applied in critical time windows. Coatings are also compatible with cathodic protection systems needed in certain industrial environments.
Polyurethane is very useful in engines and other heat generating applications that need a special type of protection against heat or other corrosive agents. Heat or corrosion resistant polyurethane coatings are formulated to protect against the oxidation that high heats naturally produce. They also shield metal surfaces against water, acid, and other corrosive agents.
Offshore, military, and chemical processing applications can realize significant performance benefits with heat and corrosion coatings. The life of steel engine components can be extended greatly. Polyurethane coatings can be applied directly to severely rusted surfaces found in many maintenance and repair applications.
Polyurea is made up of polyether-amines, or an amine terminated polyol. It is a reactive formula that does not need a catalyst. The gel time, or the reactivity is very fast and cures well on cold surfaces. Polyureas are moisture insensitive and do not react with humidity and moist substances.
The polyurea system has the disadvantage in the fast gel time. Since it is so fast to dry and cure, it is difficult to use where applications require a smooth surface or a delay in order to allow the coating to flow into hard to reach areas and corners.
Polyurea can be applied to any required thickness in one application. Pure polyuera is usually not a multi coat system, making it a very fast application and quick turnaround time. Hybrid polyurea is more susceptible to moisture and has a longer gel time because of the addition of cheaper polyurethane components.
Primers form a mechanical bond with the substrate and a chemical or mechanical bond with the liner. This makes a substrate preparation very important because a mechanical bond between the primer and substrate is necessary. Most lining failures occur from poor surface preparation and a lack of understanding between the primer, substrate, and top lining.
Success of a bond is determined by the cleanliness of the substrate at the time of primer application. To enhance the ability of the primer to grab hold of the substrate, the surface needs to be roughened by sand blasting or acid etching. This increases the surface area of the substrate by giving the primer more area to bond with.
Too much primer can cause problems. An excess amount of primer will create a layer of primer between the substrate and the top coat. This is called a primer sheen which means the primer sheets within itself allow the bottom half of the primer layer to remain on the substrate and the top half of the primer layer to peel away with the liner.
Aliphatic formulas combine toughness with maximum colour stability. It has long lasting colour and UV protection so they look great and last longer than other applications. Aliphatic liners have excellent impact, abrasion, corrosion, and chemical resistance. Noise from vibration and impact is reduced.