Humbrol Matt

any one else got problems with Tamiya and Humbrol paints?

matt colours turn out gloss.

Usually it’s a mixing problem. Sometimes I try mixing them for many long minutes before they finally return to their ideal consistency. If they refuse to do that after vigorous stirring, try a drop of Dawn in the Tamiya, or a drop of Tamiya thinner to loosen it up and start the drying process.
(Tamiya is not exactly water soluble. There are 1 or 2 elements in the paint that don’t cut well with water) For Humbrol, try a drop of oil paint thinner or a drop of terp.
If all else fails, you might be dealing with paint that is just too old, and no longer has the ability to solute and dry properly. Tamiya is notorious for that. Humbrol has been noted to have huge batches that were out of date in Japan, repackaged an marketed here as new paint.
I hope this helps

eskt big lama repaint to military spec ops