Two coats are better than one since you may miss a few spots the first time. Anything beyond two coats with a Carnauba based wax really won't make a difference. With #26 expect to wax every 4 weeks.
As far as the detailing spray it's called Meguiars Final Detail and is available only from paint supply shops that carry Meguiars products. It's available in 1 Gallon size only for approx $18.00. Get a good spray bottle and you'll never look back.
