Why does the black epoxy settle so much more than it used to? Been using it for almost 15 years now and since around covid time it seems like it settles fast. I used to mix and spray 3 coats morning, noon, end of day leaving it in the gun between coats with nothing more than shaking the gun before I shoot. Now it settles so much that I have to clean the gun if it sits more than a couple hours hours as the pigments gum it up. I'm used to it now, but I sprayed some grey yesterday and it was like the black used to be. I'm curious if anyone else notices this?