I have a LOT of Vallejo Model Color and Model Air paint. They are arranged on my open shelving.
But after 6 years on my shelf. Some of the bottles started to solidify. No matter how much I stir. The pigment just wont break up anymore. Mostly the metallic are the first to gone bad. I have about 10% of my supply just gone bad. Also all my Vallejo primers in a 200ml bottles inhibit the same problem. And I have to trow them away. Anybody here expererienced this?