Now, why should you prime your model? Well, the simplest answer would be because a coat of primer gives a model a single even colour and consistent amount of shine that makes it much easier to see any surface defects. This feature of showing up surface defects is very important in producing a top-class finish and is of itself a good enough reason to prime models in almost all cases. However, it isn’t necessary to use a primer all the time as matte colours can be used for the same function. With that explained, we can carry on with the build.