Not really. It's personal preference. I will recommend that you follow up with the Leather Conditioner afterwards no matter if you use the gel or the liquid. Cleaning products will tend to dry fabrics out, so they need the conditioning afterwards.
Welcome to the forum. Try the Graphene Spray Coating. It works great, and takes one day , not even a whole day. You'll get great protection in less time.
Hi and welcome to the forum. The ideal temps for storage are between 55 and 85 degrees. So if your garage gets above 100* consider putting it inside an insulated chest or inside in a cooler room.