Failed Attempt at Sublimating a Water Bottle with a Heat Gun

This past weekend I attempted to sublimate a water bottle with a heat gun. I first went and bought a sublimation water bottle from Hobby Lobby. Next, I had to make the design I wanted for the water bottle so I measured the water bottle. Then, I used Affinity Designer to create my design. I found banner posters for some of the broadway musicals that I like. Below is what my design looked like. I then printed out my design on sublimation paper using sublimation ink. After, I attached my design to the water bottle using heat resistant tape. You want to make sure the design is tight around the water bottle and not loose. Next, I used my heat gun and applied heat over the design. Making sure I moved the heat gun around and not staying in one place too long otherwise I could burn the design. Once the design starts coming through pretty dark that's when you know the design has transferred to the water bottle. I removed the paper from the bottle and I saw that it didn't turn...