I have some speedball yellow, it's not very opaque stuff. Is there anything I can buy from an art supply store that will make it more opaque? I have about a gallon of it so I don't want to buy another brand.
Or underprint white, then hit it with the yellow, that's best if you want the bright yellow. You can double pull, that helps, but not much. Dry it in between for best result. Also, try a coarser mesh/rounder squeegee, that gives a thicker ink lay. Most of these light colours have shit opacity, even TW.
Shad, got your email too late re the get-together. Sorry I missed you guys. Did locate grumpys, and Richie is right, the show is kind of boring - too much digital.