It really depends on how thick your vinyl is. This blue stuff I used was really thin compared to the more famous Di-Noc. So I didn't really need to heat it up to form it. However, I still did in order to get the best possible result. The only piece that really needed to be heated was the air condition vent trim.
If you use Di-Noc then you have to get a heat gun because it's quite thick.
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