Looks great Geo. There are two kinds of Tamiya Thinner and I've used both. One is a Lacquer Thinner and has a yellow cap and the other is "normal" thinner and has a white cap. It seems, based on experience, that both can be used for the paints but the yellow cap MUST be used for the grey primer, which is lacquer-based. I'm not sure if the flat clears are compatible with both thinners so maybe you got a reaction. I never got the snot shooting the clear and am not sure what happened there.