What Is Heat-Resistant Tape?
Heat-resistant tape, also known as Kapton tape or polyimide tape, is a thin, amber-coloured adhesive tape designed to withstand extremely high temperatures. In sublimation, it handles temperatures well above 260°C without melting, losing adhesion, or leaving any residue on your blanks. Its sole job is to hold your sublimation transfer paper firmly in place during pressing, preventing any movement that would blur or ghost your design.
It might seem like a minor detail compared to your printer, ink, or heat press, but tape is directly responsible for whether your transfers come out clean or ruined. Paper that shifts by even half a millimetre during pressing will produce ghosting, a shadow or double-image effect that cannot be fixed after the fact. The blank is wasted. Good taping technique prevents this entirely.
Why You Cannot Use Regular Tape
This is one of the most common mistakes new sublimation printers make. Regular sellotape, masking tape, and electrical tape are not designed for high temperatures. Here is what happens when you use them:
Sellotape melts at sublimation temperatures, leaving a sticky residue on both the blank and the heat press platen. This residue is difficult to remove and will transfer onto future projects. Masking tape chars and disintegrates, dropping burnt adhesive residue onto your blank. Electrical tape melts and can actually bond to the surface of the blank, ruining it completely.
Heat-resistant polyimide tape does none of these things. It remains stable throughout the pressing cycle and peels off cleanly afterwards with no residue. It is specifically engineered for this temperature range, and there is no adequate substitute.
How to Apply Heat-Resistant Tape on Flat Blanks
For flat items like coasters, photo slates, chopping boards, and phone cases, the taping method is straightforward. Position your printed sublimation paper on the blank with the printed (coated) side facing down against the surface. Make sure the design is centred and aligned correctly.
Apply strips of heat-resistant tape along all four edges of the paper, securing it to the blank. Pull the paper taut as you tape each edge so there are no wrinkles or gaps between the paper and the blank surface. The paper must sit flat and tight. Any gap allows the ink to sublimate into the air gap rather than into the blank, producing a faded or fuzzy area on the finished product.
One rule to remember: never tape over the printed area of the paper. Tape placed over the design will leave a visible mark on the finished transfer, as the tape prevents full ink sublimation in that spot. Keep all tape on the margins, outside the printed area.
Taping Mugs and Curved Items
Curved surfaces like mugs, tumblers, and water bottles are trickier than flat blanks because the paper needs to follow a rounded shape without wrinkling or lifting. The approach here is different from flat items.
Instead of using long strips of tape, use multiple short strips, roughly 30 to 50mm each. Start by taping one edge of the paper to the blank, then wrap the paper around the curve, pulling it taut as you go and adding short strips of tape every 20 to 30mm along the top and bottom edges. The short strips conform to the curve much better than long strips, which tend to wrinkle or bridge across the surface leaving gaps underneath.
Pay particular attention to the leading and trailing edges of the paper (where the wrap starts and ends). These edges are most likely to lift during pressing, especially in a mug press where the heating element applies pressure from the outside. If the edges are not firmly taped, the paper can shift as the press closes, causing ghosting along the seam line of the design.
For tumblers and bottles from the consumables and accessories range, the same technique applies but you may also want to consider using shrink wrap over the top of the taped paper for extra security. The combination of tape and shrink wrap gives the tightest possible hold on tall or heavily tapered items.
How Much Tape to Use
Use enough tape to hold the paper firmly without any gaps or movement, but do not go overboard. Excessive tape does not improve the result and just makes removal slower after pressing. A strip every 20 to 30mm along each edge is typically sufficient for flat items. For curved items, closer spacing of 15 to 20mm gives better results.
You should be able to gently press on the paper with your finger at any point and feel it firm against the blank surface. If you can feel it lifting or flexing anywhere, add another strip of tape at that point. The goal is uniform contact between paper and blank across the entire design area.
Removing Tape After Pressing
After pressing, allow the blank to cool slightly (it does not need to be fully cold, just cool enough to handle). Peel the tape off gently. Quality heat-resistant tape will come away cleanly with no residue. If you notice any stickiness on the blank surface after removal, it usually means the tape was not genuine polyimide tape or was a very cheap grade. Invest in decent tape. It is one of the cheapest consumables in sublimation and the difference between good and bad tape is immediately obvious in use.
Heat-resistant tape is a small, inexpensive item that has an outsized impact on your results. Tape every edge, keep it off the printed area, use short strips on curves, and never reach for the sellotape drawer as a shortcut. Get this part right and ghosting stops being a problem.