I was greatly afeeared myself, so came up with my own formula using Humbrol. That was fun, learned a lot, but not economical - I used a few tins experimenting, and then to get the right color I needed several different colours. I painted with my paint, then did a topcoat with WEM. I suggest you do the same, prime with something CLOSE (a nice Humbrol?) just thin, and then use the WEM and as they say here, "she'll be right mate!" This way 2 tins should do it especially thinned ans airbrushed.