I am interested to hear the responses to this question. I used Tamiya acrylic for years, but as you said, it requires heavy coats to achieve a pleasing red. It also never hardens. These two qualities make it impossible to do a decent job of masking and detailing a tail light lens, especially when the clear orange has the same qualities. When the Tamiya lacquer bottles showed up, I was eager to try the clear paints, but disappointed to find they behave exactly the same as the acrylics. I have lately been seeking alternatives with better colour saturation that go on thinner and will properly dry/harden to allow masking.
Has anyone tried the Alclad clear red, orange, or amber? I am curious to know how they perform relative to the Tamiya clear colours.