A few tips: None of our hotfix rhinestones have an application temperature of 350 degrees F--you very well may be "over cooking" the heat activated adhesive on the rhinestones. For ss06 and ss10 rhinestones, we recommend 325 degrees F for 15 seconds with medium/firm pressure. Pressing hotter or longer damages the adhesive.
Larger rhinestones require a slight temperature increase, as they have a larger profile and you need to get the heat all the way through the rhinestone to activate that adhesive.
Also, just to clarify, do not press rhinestones directly to HTV Anything. They will not stay on, as there is not a layer in the HTV Anything to secure the hotfix rhinestones. If you ever want to create wraps or decals with just hotfix rhinestones, you'll need to use our Bling Anything decal material.
The HTV Anything and glitter htv tend to hold onto heat quite a bit. Allow your wrap to cool slightly before removing the hotfix tape, so the heat-activated adhesive has a chance to re-solidify first.
We also do what we call an "insurance press", where we flip the entire wrap over and press for about 5-8 seconds from the back, to be sure the rhinestones are well adhered to the glitter htv layer.
Hope these tips help! If you are still having issues, please feel free to email our service reps at [email protected]