We have tried: We tried ironing this tape from the reverse side on the sewn and grafted seams of summer softshell 840041 and winter softshell 860025 and 860203. The tape adhered perfectly and held beautifully on both materials. We tried ironing the tape over baking paper and without baking paper, and both ironing options are possible. You just need to follow the recommended temperature of the iron (in our case, low/middle heat for 5-10 seconds) and ALWAYS test it on the rest of the material to avoid damage and deterioration of the tape.