I am using 100% cotton standard tshirts. Tried three different brands (anvil, gilden, and american apparel). I am using 315 degrees on a geo knight dc16 for 30 seconds. I have tried light, med, and heavy pressure. I can feel the toner sticking to paper. It is usually difficult to start removing the transfer as it pulls up on the garment not wanting to let go of the foil. If I use the same design replacing the white with another color, no issues.