What Is the Difference Between Epoxy and Resin

It is worth noting that Epoxy and Resin are adhesives that are mostly used in the construction industry. They are liked in these areas because of the level of strength they have when bonding things together. However, there are vast differences that can only be differentiated by applying each one of them.

They are commonly known as plastic adhesives, and they are mostly used to join together metals, glasses, and plastics; professionals dealing in the construction industry will always have these adhesives.

Whether building roads, constructing an ear plane or ships, and other heavy machinery, they use most of these adhesives to join s parts that they expect to stay for a long time.

Other uses include artisans making jewelry, home improvement such as coffee and water tables, among many other uses.

Why Use Epoxy or Resin in Construction or Craftsmanship?

Since they are known for strong bonding properties, these adhesives are highly recommended because they last longer, insulation properties have heat and chemical resistant properties. They are sold in various home improvement stores either in containers, in powder form, glue gun cartridges, and syringes.  But in all these, numerous differences exist between the two.

This article is going to exhaust more on what makes one unique from the other.

Resin vs Epoxy

It may be hard  to distinguish  these two adhesives, but one important thing is to note that there are two terms used to make things a bit easier, and anyone can appreciate this; Epoxy Resin and Casting Resin.

Epoxy Resin vs Casting Resin

What makes the difference between these two is their use.  When it comes to Epoxy Resin, its main use is for coating surface application while casting resin is used in figurines, jewelry, and molds. But then, any of these can replace each other depending on the strength you need when joining together parts.

ALSO READ: How to Add Color to Epoxy Resin?

Differences Explained


Casting Resins are thinner than Epoxy resin. This then means that they take more time to cure and produce less heat, resulting in a thicker mixture.  It so often a challenge because of its thinness, and mostly when poured onto the surfaces, it tends to run over the edges, which dictates that a frame or something to hide the runovers is fixed to clamp together that material being used.

Processing Time

Processing time is the time taken from the minute one starts making the mixture to pour the adhesive onto the surface. Remember that there is extra care that must be taken while mixing to avoid bubbles from popping out. The measures used, the tools used must be prepared in advance. When it comes to the casting resins, they take longer to cure, and as such, their processing time is longer compared to epoxy casting, which take as little as 5 minutes, and the work is complete. 

To quicken the processing time for the casting resins, exposing them to higher temperatures would be helpful.

Time  Taken To Cure

We need to note that casting resins will take at least 18 hours to gel compared to epoxy, which can take as little as  20 minutes.  This then translates that casting resins will always take longer to cure, at least 36 hours, while within 12 hours, epoxy resins will be readily cured. This difference exists because of the thickness that casting resin has, and therefore they dissolve heat at a lesser speed than the epoxy coating, and thus, the period needed to cure is longer.

On the other hand, costing epoxy in too a solution will not give a presentable result, and at one time, the epoxy could heat up much later and cause the surface to crack and shorten the lifespan.

Bubbles Vulnerability

While both the products are vulnerable to bubbles, casting resin may be less noticeable. This is because of its thinness, and when one is mixing, they easily pop in comparison to casting resin.

One can clear them faster and get a glossy and smooth surface more easily. However, each of them can form the bubbles and mostly if the missing was not done in the proper proportion.

To avoid bubbling of any of them, be careful of the surface being used. For instance, when using wood surfaces, use a seal coat to coat the surface before application. This will keep away the bubbles because any porous areas will be sealed, and no air will slip out to create room for bubbles.

The Hardness

Casting Resins are much softer than coating epoxy. For casting resin, the hardness can be determined by the mix ratios to allow room for the substance type. For instance, if it’s a glass material, it needs to be flexible to expand and contract depending on the temperatures. This means that when one is mixing the casting resin, one will ensure the variation in temperatures when cured and ready for use.

On the other hand, coating epoxies will provide an ultimately hard project that does not need such variations.

ALSO READ: Polyester Vs Epoxy Resin

Epoxy Resin vs Fiberglass Resin

As mentioned here above, what determines how to select the adhesive to use is the job one is involved in.  Epoxy resin is an adhesive used as sealers and used in building and construction applications. On the other hand, fiberglass resin is a form of synthetic material made from combining organic acids and acids. It’s mostly used as a casting material and excellent for fiberglass lay-up such as wood filling, auto repairs, building a boat, and more.

A question keeps on reflecting when people are using the adhesives; about the difference between resin and plastic. The only difference is that resins are produced from plant oozes, and as such, they are more natural compared to synthetic plastics.

Frequently Asked Questions

Q. What is better, plastic or resin

A. Plastic has fewer impurities. It’s produced from petrochemicals compared to resin which has many impurities because it’s directly generated from plants.

Q. Is resin dangerous?

A. If not carefully used, it can affect one’s health. For instance, if it evaporates into thin air, it can irritate one’s eyes, cause blockage and respiratory problems. It’s always advisable to use a face mask or respirator to keep off from such effects while using it.