Plasti-dip does not like to be sprayed in the cold. What I would suggest is to fill a bucket with warm water and let the cans sit in the water for 5-10 minutes (obviously don't let them get too hot). That should give you enough time to spray a coat or two then just repeat. This is what I did last winter when I painted my emblems. Cold can = very rough spray pattern.
As long as the tips are double rolled you should be ok. The stock exhaust tips should be fine. Aftermarket systems will vary, although most i've seen use double rolled tips. If the plastidip gets too hot it will harden and crack and not come off without damaging whatever surface it is applied too. This is really only a concern when you are talking about temps in excess of several hundred degrees. Just baking in the sun isn't going to harm it. Ask me how i know ;)
I'll prolly wait for warmer weather, just so I can take my time and do a clean looking job. Also wanna put a light tint on turn signals and back up light. Going for the green and black look.
I had my rear valence done on my GTI before and the exhaust tips were not hot enough to melt the plstidip off. As long as it is not touching anything hot it should be good
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