I dipped a heat sink but the print ripped within seconds after the dip. Did not pre-treat the surface with any chemical but sanded and scuffed thoroughly. Used acrylic paint and home brew activator. Took me by surprise as the paint was used many times for many successful dips. Thought the aluminium surface reacted with the activator or the paint did not grip properly so switched to 2k paint but same situation. The film is from Taiwan. 2k paint is NEXA. I suspect over activation but the film will not glass with less activator. One thing new here is that the lid of my activator gallon was discovered ripped as if gas pressure from inside ripped it open. Its winter season here and average tempratures are 25C. Last time i checked the activator container was a week ago and it was intact then. First pic is with 2k paint and the second is with acrylic.