There are tons of great benefits of working with sublimation and 100% polyester garments things like moisture wicking, durability, soft hand, and beautifully bright, vibrant colors are just a few of them. Unfortunately, there is also a little drawback: those little transfer lines can ruin a perfectly good sublimation shirt.
Fortunately, several steps can be used to eliminate those transfer lines, and typically some combination of the steps or using all of them combined will solve this issue. You need to test to see what method or methods will work best for you and your setup. There is no magic button as there are several variables in this, like the type of shirt, your heat-press, the pressure and temperature used, and other issues that could be causing the transfer lines.