As a hand brush painter, I've only been using Tamiya fine surface primer (rattle can) up until this point. This meant that cockpit interiors and other small parts never ended up being primed because I didn't feel like it was worth it to waste spray can primer on such little parts. Obviously, by doing this, I ran into paint adhesion issues for any areas left unprimed. I decided to give this primer a go and was not disappointed. To be clear, I still use Tamiya rattle can primer for 90% of my models, but this Vallejo excels in the hard to reach areas. Simply brushing this on allows any paint on top of the primer to adhere much better than not using anything.