There are many types of resins that you can use for crafts. In this article, we are focusing on polyurethane resin that can be used for a variety of applications. Casting resin comes with two parts such as resin and hardener and the mixture only hardens once they are mixed as a result of the chemical reaction that occurs,
Polyurethane or PU resin can be combined with colours and other additives to give them different properties. If you want to increase the processing time of the resin, you can add an inhibitor to it. And this allows you to work with the craft a little bit more. If you are looking to arrive at a certain colour, there are many fluorescent dyes and pigments that can be found on a resin website. And you can also include fillers such as glass fibres, cotton flocks etc. to the resin so that you can experiment with surface hardness, stiffness and the mechanical strength of the resulting craft. Make sure you read into the different types of resins available and their properties before you choose something for a project. You should have a clear idea of the properties you are looking for when it comes to the resin. And this will definitely vary when it comes to different projects.
You will find it very easy to work with PU resin as it is easy to mix and process. And you can easily shape or case the resin as it has moderate viscosity. If you are looking to create a model with thin walls that has a high level of stability and strength, PU resin is a good option to consider. And if you are on a deadline when creating a craft, PU resin will not let you down as it will harden quickly allowing you to take it out of the mould in a short time. This will not be the same experience if you are working with epoxy resin as it can take hours or days for the project to cure. There are so many ways you can experiment with PU resin as there are various additions that can be used alongside it such as filling materials, inhibitors, pigment pastes etc. And there is very minimal shrinkage when the project cures. You can even use PU resin as electrical encapsulant. Unlike UV resin, PU resin will have a high resistance to heat once it is cured.
There are a few downsides to PU resin as well. When you understand the limitations, you can get a good idea of when to use it. For example, you should avoid moisture due to the high sensitivity of PU resin to it. You will notice foaming if there is moisture. And if you are looking for a product that is weldable after curing, this is not the resin to choose. Make sure that you include additives that will make the finished product insensitive to light or there can be slight colour changes after a while. The fast curing time has a downside as well because you need to work fast.