When the sun is out I like to put it on the Blazer dashboard for a bit depending on how warm it is. In winter it's either in the oven on low or in the windows of our enclosed porch depending on how cold it is. A heat gun should work well, too. I'm not too specific on times and stuff as I think that it isn't rocket science and I do what works for me. I once made a practice seat and left it outside, unintentionally at the start, for about 6 months in all sorts of weather and it looks pretty cool.