hey Helo, i have tried this technique ever since reading the Complete Future by swanny. i have heard of people using tamiya acrylics with it and i decided to try it with the gunze too! the results are amazing as you described. Plus you dont need to clearcoat your finish to apply decals!
but i still use another topcoat of just plain future before i do my weathering. i also try adding alcohol to the mix.just a bit.
BTW, i just use distilled water with my Gunze paints together with some Mr.retarder. and i like the results
the gloss does not dissapear unlike when using alcohol.