I printed my One Stroke sample today on a navy shirt (used 86 mesh), no underbase. Wanted to compare it to a shirt we did several months ago with Union and an underbase. There was actually no difference. However, we then printed the same logo with Union again and no underbase and got a bleed-through on the navy shirt with a P-F-P and a 100% cotton material...strange. Also noticed the One Stroke is a bit thicker in consistency, but still easy to print. Anyway, thinking I may stick with One Stroke for silver shimmer (it looked nicer and no underbase needed). Still love and use Union for some of their other products - their Premium Bright Cotton White is unbelievable since it needs no stirring or additives - a huge timesaver!!