Gorilla Glue
ANS 2 - 'Gloozit' Plumbers Goop is better for that purpose.
A glue called Seal All. Available in many hardware stores.
The new car smell is caused by products used on the leather to clean and preserve it. It is a part of the leather or vinyl. The best way to remove it is to open the windows and allow it to air out. It will fade with time.
Best way to break-in leather boots is to wear them!
Buy a leather care product such a Mothers Leather Care.
It is easy to repair vinyl furniture yourself. One way to do it is to purchase some vinyl fabric that is the same color as your furniture, cut a piece slightly larger than the hole or rip, place the fabric inside the hole apply vinyl adhesive around the edges of the hole and press the pieces together. You can also buy a repair kit such as Master Caster Leather Vinyl Repair Kit at Office Depot, Magic Mender Repair kits from http://www.magicmender.com/, or the Liquid Leather and Vinyl Repair Kit at http://www.asseenontvguys.com/leather-repair-kit.aspx.
The best way to clean leather briefcases is to use specialist leather cleaners. Autoglym, Renapur and Astonish are all producers of these products and all can be purchased at Amazon.
cut it
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If your leather photo album cover is getting sticky, it's probably not leather, but instead vinyl. The best way to get it less sticky is to us some spay cooking oil (remove or cover pictures/pages with a gallon sized zip bag). Rub the oil in and let is soak in, repeat as necessary.
The best way to clean black leather is to vacuum and dust with a dry rag. For deeper cleaning or to remove stains it is best to follow the manufacture's instructions as there are different kinds of leather requiring different kinds of care.
The best way to clean a leather recliner is to spray either glass cleaner or apply a wet rag to the couch. Since the couch is leather, it will be cleaned easily with water and glass cleaner.
The best way to clean leather cellphone covers is to use a cleaning product like Mr. Clean Magic Eraser. Make sure to be gentle when cleaning the cover as over cleaning leather tends to darken leather.