What is the difference between Casting and Coating Resin?

August 03, 2022 3 min read 3 Comments

What is the difference between casting and Coating Resin?

Casting and epoxy resin coatings are unique but related compounds. The choice between the two will ultimately determine how the final product will look and function.

Cast resins, also called "deep cast resins" or "cast plastics", are used for clear cases and suspensions. The user pours the material into the mold and then fixes it to keep the same shape. Cast resins are often used to make crafts, jewelry, sculptures, and memorabilia. Manufacturers can also produce aggregates, molded plastics, or electrical insulation using casting resin. Engineers design automotive parts, aerospace equipment, sports equipment, and hundreds of other products using epoxy resin-reinforced compounds.

Coating resins, on the other hand, are aptly named: they are used to coat materials such as metal, concrete or wood to make them stronger, abrasion-resistant, easier to clean, waterproof and corrosion-resistant. A thin layer of coating resin can also bond materials or save paper. In the electrical industry, coating resins are applied to embedded circuits and transistors to hold components together and protect against corrosion. In addition to these application differences, there are some other significant differences between casting and epoxy coating:

Choosing the right epoxy resin for your grout application

Viscosity: Casting resins are usually thinner compared to coating resins. Curing Time: Because liquid casting resin is poured in thick layers, it takes longer to cure to prevent shrinkage and heat build-up.

Hardness: Coating resins are usually harder and harder than casting resins. Mixing ratio: Most paint resins use a 2:1 ratio, but casting resin formulas can vary, such as 1:1 or 2:1. Although there are many similarities between the two types of formulas, it is often easier to use the formula that best suits the intended application.

For example, if you pour resin on the surface instead of a thin layer of coating resin, the resin will flow over the edges and harden very slowly. On the other hand, if your epoxy goes into the mold, you have to apply several thin coats and wait for the material to harden between applications. Otherwise, the heat generated from the bulk cast material will accelerate the chemical reaction and cause yellowing or cracking. Important questions about epoxy resin If you're not sure what type of epoxy to choose, consider the following: How thick of epoxy do you need for this project? How long do you have to wait for the epoxy to cure? Do you need a mold or frame to prevent leakage and hold the epoxy while it cures? How hard should this material withstand expected wear and tear? Do you want to stop using epoxy resin materials? Do you need an epoxy with special properties? Will this material be exposed to extreme temperatures, water, chemicals, UV rays, or other potentially harmful elements? Epoxy resin systems can be customized to meet unique project needs. Manufacturers use a variety of coreactants, including, for example, polyfunctional amines, phenols, and alcohols, all of which give slightly different results. The type of epoxy base and additives in the formulation can also change the viscosity and internal properties of the resin. Epoxy resin viscosity Viscosity describes a fluid's level of resistance to flow. In the context of epoxy resin formulations, viscosity determines whether the material drips or spreads evenly, and whether it must be poured, dipped, or painted onto the material. Viscosity also affects how much epoxy penetrates the substrate and what physical properties are created. For example, at Copps Industries we manufacture three lines of low, medium and high viscosity epoxy resins: Low viscosity Low viscosity epoxy resin is thin and ideal for deep penetration and small cavity filling. The consistency helps prevent air bubbles, which facilitates the bond between the epoxy and the substrate. You can use low viscosity epoxy resin for encapsulation, sealing and potting. Medium viscosity Medium viscosity epoxy is thick. It is less permeable than low-viscosity preparations and offers greater mechanical strength. The material withstands medium high temperatures and is often used for fiber winding, vacuum packaging and machining. High viscosity epoxy High viscosity epoxy has a paste consistency and is the strongest option. It offers excellent grip and resistance to impact and heat. Engineers use this formula for projects that require extreme durability and strength.

3 Responses


April 07, 2024

at accusantium commodi omnis aliquid saepe nam. at non atque et quis et illum nisi est officia cum occaecati fugiat et iure id. voluptas qui in iusto dolor voluptatem placeat praesentium similique com

Clare Martin
Clare Martin

October 24, 2023

Thank you for explaining to us that cast resin can be used to produce electrical insulation, so engineers often use epoxy resin-reinforced compounds to design automotive parts and equipment. My brother runs an auto repair center in Albion Park, and it seems like he needs a new distribution transformer for the shop soon. I’ll take note of this while I help my brother find out where he can look for cast resin distribution transformers for sale soon. https://www.gbeaustralia.com.au/transformers


July 27, 2023

Hi, Can I use casting epoxy 3:1 for river wood table-top and coating epoxy 2:1 on top part for glossy and strength.. Plz guide me

Leave a comment