I printed matsui opaque white on a denier poly nook case (trash) for giggles and then flash cured it. I melted one side (because the phone rang and i forgot to start the timer but I was fine on the other side. I later took the power washer to it for 5 minutes and it didn't phase it at all, i was sure it was going to flake off but i was pleasantly surprised. I have even printed it to a piece of glass and again found it to be relatively durable i had to take sharp metal to it to get it to scrape. There is no issue with mastsui bonding to poly. It has issues with stretch and migration. Hence stretch versions and low bleed underbases. I have also printed black on 100 percent white and have washed it a number of times and have had no issues with it coming out. I make no promises, just sharing my experiences with matsui so far. I goof around quite a bit to push the boundaries of my knowledge a bit so I do a lot of weird things that make people shake their heads. I also don't trust manufacturers to tell me the truth, most of the time they just tell me part of the truth and try to sell me something else. That's why I always have to try the things they tell me not to try, mostly with horrific results but sometimes please fly surprised.