Besides using a paint brush - try using a sponge kitchen cabinet roller and apply a few thin even coats of paint and then lightly sand. (thepurplepaintedlady.com)
Repeat with the second tablespoon of cornstarch, or until the tofu cubes have a nice even coating of cornstarch. (budgetbytes.com)
In a medium size bowl, combine the chickpeas with turmeric, coriander, cumin, salt & pepper and olive oil and mix to ensure even coating. (fitfoodienutter.com)