I think it will defeat the purpose if you mix the blocker in with the white, I hate using bleed blocker because how the white print lays on top of it, but on some stuff it's a must, we use wilfex bleed blocker gray and One stroke ELT-S white for top or IC cool white 7022, both are low cure inks with bleed resist in them which also helps. We just printed some adidas cardinal jerseys and those things aren't nothing but bleeders, so a gray blocker base was a must since the print was mostly white ink, oh and some bleed blockers are better then others, some are to dark for a top white etc.