I will second that.
... I've always used acrylic paint. The cheap little 2 oz bottles you get in the hobby section at most any department store. A couple bottles will cover a plane nicely with paint left over.
sometimes I water down the paint slightly for smoother quick coverage,
as with the euro fighter picture
sometimes I water down PVA glue 50/50 for final coat once paint has dried and it gives it a glossy shine 😍
and seals the paint
Fly it like you Stole it