Dry brushing acrylic on acrylic

I do a bit of acrylic drybrushing over acrylic base coats. First off, if the base coat was airbrushed on w a laquer thinner (tamiya's yellow cap thinner) then you have a way more robust layer underneath. Other paints have different adhesion abilities and may stay down better, like Vallejo's. If it was brush painted on then a flat acrylic clear coat like Vellojo's flat clear would definitely prevent the base coat from coming up. Last thing to remember is when doing the dry brush coat you dont want the paint too thin and you HAVE to use an acrylic retarder to keep it going otherwise it will paritally dry and you will have a mess. Hope this helps

Steve