You can use Vallejo primer. There is a lot of colors to choose (black, white, rust red, OD, russian green, german yellow, etc). So it serves as a first colorcoat. It also has the advantage of being self-levelling, so you can apply it by brush. There will be no brush marks and it makes a very thin layer. It is not really acrylic but acryl-polyurethane, but it has very little odour.
It has its disadvantages, though:
1.- Never forget to shake it well before using.
2.- Minimum curing time is AT LEAST 24 hours, but it will be much better if you give it 2 or 3 days.
3.- It works fine when you are sure that the building phase is over and you won´t have to sand, file nor correct it any more; but this stuff creates a thin film, some kind of elastic skin, and if it is not PERFECTLY cured you can make small balls if you try to sand, file, etc.
My 2 cents.