Those of us who do heat transfers professionally do use inkjet printers, some use laser printers. A lot of us use JPSS paper. I have transfers that I put on shirts several years ago and they still look good. I would never use an iron for applying transfers to sell to anyone, I've always used a heat press. The heat press provides equal heat and pressure to the entire image area. I don't know what kind of printer you have but I think most of us have Epson inkjet printers. I would suggest using good ink in your printer.