There are many different types of Resin. The most common crafting resin is Epoxy Resin which comes in two parts, resin and a hardener. After mixing, It will start to cure and harden over a period of 6 to 24 hours (depending on the brand). Although most crafting resin has a UV stabilizer added, epoxy resin will yellow over time. You are able to find different brands and explanations on Epoxy Resin by doing a google search.
The type of Resin we use at BlueStar Boutique to make most of our jewelry pieces is called UV Resin. UV Resin is a single compound resin, which means there is no need for mixing. It cures by exposure to UV light, UV lamps or natural sunlight. With its UV curing characteristics, there is minimal to no yellowing overtime. Using UV Resin for crafts is still fairly new.
Below I will list out some pros and cons of UV Resin. Please bear in mind these are based on my own personal experiences.
-Faster Cure time
-Better control of layering and placement
-minimal to zero yellowing over time
-No need to mix resin to hardener
-Easy storage of left over colour mixes
-More expansive than Epoxy Resin
-Molds must be clear, to allow UV exposure
-Thick layers may need up to 30 mins of consistent UV exposure, which may be hard to obtain depending on set up and weather
-Currently not sold at craft stores
There are pros and cons to both types of resin. Personally, I like working with UV Resin for its non-yellowing and fast curing characteristics. If there is something you would like to add or ask, please feel free to leave a comment!