In the vast majority of epoxy systems, the process results in yellowing. Here, the yellowing time and the amount of yellowing vary according to the preferred epoxy type. Resin Slim Extra and Resin Mass are the best resins produced in this direction.
The main factor causing yellowing is sun rays, but the sun is not the only reason for yellowing. The waiting time of the epoxy in the package, the heat generated during its curing, the physical and chemical effects in the environment where the epoxy is cured are also side factors of yellowing. Unfortunately, there are many determining effects that prevent us from placing a clear expression on this period.
In order for your epoxies to remain transparent for a long time, you should first choose epoxy types that are resistant to yellowing such as Resini Mass and Resini Slim Extra, then you should protect your product from direct sunlight, limit chemical effects and not expose it to high temperatures.