I think you are right. I am not sure if I started going limp while the molding got hard and/or if I didn’t press it to my body correctly. I also need to tap it (as I read about in multiple places and still didn’t do) because there were air bubbles around my cock head and under the shaft which probably happened if my cock was moving up and down in the tube. They looked like that kind of tacky result you would see with glue in your fingers drying. I think the stuff I bought from Amazon was wayyyy easier too and there was plenty of it for the tube.
Stay tuned!