You can try tearing the edges of the paper so that it’s a torn, beveled edge instead of a crisp cut edge of a sheet of transfer paper. I’ve had improvement with this but still can see the imprint of the torn edge on some shirts. A pad is the best idea. If you use silicone, it might just leave the imprint of the pad (from below) on the shirt, which is called a “scorch mark” when heat pressing. You can also buy heat press foam pads that you can cut the top edges down, again to form a bevel. Make this smaller than your paper’s edges. That helps too. Unfortunately, I’ve found that on some polyesters, they just scorch. If you can get transfers made to press at a temp lower than 295-300 deg, that is helpful as well. If you google about preventing scorch marks in poly, you’ll find other suggestions.
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