Likely Causes

1. Under-cure (temp/time low): Powder not fully fused to film.

2. Wrong powder grade: Hot/warm/cold peel mismatch lowers bond.

3. Press pressure too low: Insufficient penetration during transfer.

4. Contaminated garment surface: Softeners/oils block adhesion.

5. Moisture in garment: Steam created during pressing can interfere with adhesion.

Quick Checks

• Verify platen temp with IR thermometer (calibrated).
• Check powder grade vs film spec.
• Increase press pressure to medium-firm; retest.
• Pre-press garment 5–8 s to drive moisture.
• Wash-test 2 cycles @ 104°F/40°C.

Step-by-Step Fix

1. Raise cure to 240–250°F (115–121°C) +15–30 s — Completes adhesive melt.

2. Match powder grade to film; sieve if needed — Ensures compatible melt & flow.

3. Increase press pressure & verify dwell — Improves bond formation.

4. Pre-press garments briefly — Removes moisture and wrinkles.

5. Clean platen & use parchment barrier — Prevents contamination transfer.