Try DAP Draft Attack window weatherproof sealant, says it can be removed easily. Home Depot lists it.
I looked into that about a year ago. The company told me it was intended for seasonal use only and not intended for permanent nor long term use. So I was left with the idea it wouldn't be good for auto use. Do you know anything different about it?
I am looking into a product called Big Stretch, but the company has not responded to my questions yet. I've used it for house repairs and it is excellent for that. I just don't know if it will hold up to the temperatures we get in the south. The black color is more costly.