Basecoat
Still following my principle of doing stuff on the cheap, I wanted to avoid using the expensive Games Workshop basecoat sprays.
For that, I use the Montana set of spray cans. They have a large range of available colors that you can use for basecoating. They cost about 5€ a can, and the quality of it is impressive. It attaches well to the minis, covering it perfectly and the nuzzle can help doing very fine targeting.
I recommence shaking them well before use and do a few first sprays on a bit of cardboard on the side. Otherwise you might end up with bloated paint that will hide minis details and will be hard to paint over.
I currently have sprays of White (as my default), but also green, red, brown, bone, flesh and putrid flesh for various types of minis. I found that it greatly helped me paint a whole horde of Zombis (Zombicide) or orcs. Be careful though as you might not have a 100% exact match between the color in the basecoat and the one in your painting. It wasn’t an issue for me, though.