This difference is important to know for your resin success! Depending on what you want to make, choosing the right resin for your project is important so that you can get the results you want.
Let’s start with a couple basic concepts
A doming resin mixes thick enough that when you use it, it finishes in a smooth dome on your project. If you think about it like a teardrop, when you drop doming resin onto a surface, it will stay in a domed shape. A doming resin is what you want to use when you want a curved surface to something or if you want to use resin on a surface where there are no sides to keep the resin contained. The surface tension of doming resin will be enough for it to want to stay on the surface. Note: The larger the surface, the harder it is to keep resin on that surface, even if it is a doming resin.
A casting resin mixes in a thinner viscosity. It is meant to be used in something with sides like molds. This thinner viscosity is what makes casting resins ideal for spreading into all the intricate parts of a mold. You could also use a casting resin a bezel, but is is not going to have a domed finish. Casting resins also do not self-level like doming resins do. This means that casting resins will not necessarily level themselves out over a surface.
When would you use a doming resin?
A doming resin mixes in a thicker surface tension and is going to stay on the surface of something without sides. For example, if you want to do resin for artwork, you want a doming resin so that it will (mostly) stay on the surface of your painting.
All of these paintings are made with a doming resin: Resin painting studies
Doming resins are important if you want to make jewelry with a domed finish. You can see a few examples of using a doming resin to make jewelry with and without a bezel here:
Note: The larger the surface, the less likely you are to keep all of your resin contained, even if it is a doming resin.
When would you use a casting resin?
Casting resins are meant to be used for just that – casting. You should pour them into something that has sides to be able to contain it. They can be poured into deep layers if desired. Since they don’t mix as thick, removing bubbles from this resin is easier compared to a doming resin.
Here’s how to use a casting resin to make resin bowls.
Can you use doming resins and casting resins interchangeably?
Yes, but you may not get the results you want. Doming resins are meant to be cast in no more than an eighth inch depth to allow bubbles to easily escape. You can cast a doming resin in a thicker layer than that, but it is likely to retain bubbles. If you are using a deep or intricate mold, it may be hard for you to get all the bubbles out before it starts to cure.
A casting resin can be applied to surface without sides, but because it mixes thinner, it will not want to stay as a complete mass. It will continue to spread out and will produce the dreaded ‘fish eyes’.
What should I notice when I’m mixing these resins?
How do I know if I’m buying a casting resin or doming resin?
When you buy a resin, it is going to be one or the other. If it that information isn’t on the packaging, ask! For the resins sold on Resin Obsession, we have that information in a PDF link in this article: resin casting
Can I apply multiple layers of doming resin or casting resin?
Both will take additional layers. You can wait until the previous layer is fully cured before applying the next layer, or if you only wait until the previous layer starts to gel, you can pour the next layer and minimize the lines between them.
If you want to see differences between doming resin and casting resin, this video shows you:
What other questions do you have about using casting resin or doming resin?
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