This is a Spray Can of Light Gray Fine Surface Primer (L) from Tamiya.
FEATURES: After preparing the surface to be painted, a thin coat of quality primer is necessary for the paint to stick properly.
The coat of primer will do 2 things: 1. Since it's a flat paint, it gives the color coats a good suface to adhere to. 2. It highlights any defects in the finish that may need to be corrected. For use on plastic and metal.