When epoxy resin and hardener are combined, epoxy develops, which is a two-part adhesive. Additionally, it fills gaps, which makes it ideal for reconstruction. Epoxy can also be painted, drilled, and sanded. It now has a far larger range of applications than traditional glue.

Applications
Epoxy two-part coatings were created for heavy-duty use on metal substrates and consume less energy than powder coatings that are heat-cured. These technologies offer a hard, protective coating that is very strong. Epoxy coatings have a component that is designed as a water-based emulsion and may be cleaned up without the need for solvents.
Since they are more heat resistant than latex- and alkyd-based paints, epoxy coatings are frequently utilized in industrial and automotive applications. Due to UV exposure, epoxy paints have a propensity to degrade, often known as "chalking out." Epoxy coatings have also been employed in situations involving drinking water.
Yellowing is a common phenomenon for epoxy materials and is sometimes a cause for worry in applications involving art and conservation. Even when not exposed to UV light, epoxy resins deteriorate over time.
For washers, dryers, and other "white goods," polyester epoxies are utilized as powder coatings. Steel pipes and fittings used in the oil and gas industry, steel water transmission pipelines, and rebar used in concrete are all significantly protected from corrosion using Fusion Bonded Epoxy Powder Coatings (FBE). Additionally, epoxy coatings are frequently used as primers to enhance the adhesion of automotive and marine paints, particularly on metal surfaces where corrosion (rusting) resistance is crucial. Epoxy is frequently used to cover metal cans and containers to stop rusting, especially for acidic foods like tomatoes. Epoxy resins are also utilized to create decorative flooring materials including terrazzo, chip, and colored aggregate.
Epoxies were altered in a variety of ways. For example, epoxy esters, which were cured similarly to alkyds, were produced by reacting epoxy with fatty acids extracted from oils. L8 (80% linseed) and D4 ( 40% dehydrated castor oil) were typical ones. Styrenated epoxy esters, which are employed as primers, were frequently created by reacting them with styrene. Making drum linings by curing with phenolics, curing esters with amine resins, and making resistant top coatings by pre-curing epoxies with amino resins.

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