What brand paints do you guys use and do you put anything in the bottles to keep the paint from settling? I have mostly the small bottles of m-f paint and some of bears paints. I tried to see if there was a top cap to pull off to add a couple bb's or something but it looks to be recessed and as if maybe the pigment was injected into the bottles. I also tried to microwave them for a few seconds but it did not seem to help much and I lost a bottle of silver, only had it in about 8 seconds and it busted. Any help?