Tamiya acrylic adhering to Model Master Acryl

cruichin wrote:

As an update, I spray painted the Tamiya and it adhered. Must be my brush technique that was lacking!

Nope, not your technique, the paint. It skins over almost immediately, looking like it's cured, but the paint below is still wet. The new paint dissolves the skin, causing the paint below to loose adhession to the surface. This brand has been acting this way for th epast 10 or so years. The original formula was great for brush painting. No barriers or techniques will stop this form happening.

As an update, I spray painted the Tamiya and it adhered. Must be my brush technique that was lacking!

No, your not missing anything. Tamiya acrylics seem to want to lift the first coat for some reason? Make sure your first coat is completely dry, that will help, maybe overcoat it with an enamel clear? Tamiya paints are great for airbrushing, but they are a real pain to brush on, I never had any luck anyway!