Ordering them direct from the MIG website is like half the cost of buying them through SprueBrothers or wherever.
I apply them with a brush, rub them in nice and good, and then dabble Mona Lisa Odorless Thinner over them with a big soft brush. But I'm thinking I may try airbrushing the thinner next time. Low PSI at a distance and I'm pretty sure the pigments wouldn't fly off. But then I always apply them over a flat surface so they'll work in better.