The Tamiya fine surface primer is perhaps the best plastic model primer available. It has great adhesion properties and very fine pigments. This makes it excellent for getting into tight spaces without paint build-up. I usually put an initial coat on, using the primer to help identify seams or irregularities that need to be puttied and sanded, then repeating the process until surfaces are smooth and continuous under a final coat of primer.

I use this primer on small scale resin, metal, and plastic models. Used as directed, it won't obscure fine details like many primers. It tolerates being sprayed in a wider temperature and humidity range than other products I've tried, and the nozzle is not prone to clogging. The light gray color makes it very easy to see any flaws or rough spots on the model before painting. It can be painted when dry to the touch, but if left at least 12 hours will cure to a very tough, durable surface.

Overall, this is the best primer that I have used. I have both the white and light gray. They both are just as good, I have more of a personal preference to the gray though. It helps show any imperfections in the model, and gives a nice even coat as long as you don't hold the can in one spot for too long. I have only had a problem once with paint not sticking to the primer. I would highly recommend this primer.