My house is Salmon, my trim and door is red. Can’t paint the house yet so I’m changing the trim. I don’t want the traditional white or brown door. Thinking of a dusty/grayish purple. Am I crazy?

I have exposed rock surface in a portion of my garage that I would to insulate and spray to avoid water leakage and insulate from the cold. Are there products that can be painted on or sprayed on that will insulate and seal?