My problem with it is precisely because Tamiya acrylics drys WAY too quickly. It literally dries on the brush seconds after exposure to air, then it dries into small grits onto the brush that's not even washable by water, having to use thinner to remove. In general flat colour is more prone to drying than their gloss range. Their semi-gloss can be treated the same as flat in terms of drying time. Most of local HS where I get my paint supplies do not have retarders.
If I must, I would thin with Tamiya thinner + water extensively and apply thin coats, and apply it multiple times to achieve eventual coverage. This obviously does not work well on small/complex surfaces due to paint pooling and is for large surfaces only. With Tamiya acrylics if you can see brush strokes, it's already starting to dry and it will not end well for you. Better it be a pool of thin paint instead.