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Well, surely it depends on how many figurines and other decorations you need to varnish if you preferer spray or brush on wax, but the spray is easy to handle and will dry in 15 minutes.
For sure the sun is the biggest enemy for all our outdoor decorations like figurines, statues, solar lamps, furniture, and other décor.
The sun will make the color fading, cracking, and peel, so you will need to protect it, so it can stay out the year around and still look good as new.
You can use it on any hard surface like resin, cement, metal, wood, ceramic, acrylic, stone, plastic, fiberglass, and more, but don't spray any cloth it is not meant for textile.
There is a bit of an odor when you use it, but as it will be used outside, it doesn't matter, and it is dry after 15 minutes, meaning you are able to touch the sprayed product, it will not change the original colors but safe them.
It is advised to give all your outdoor decoration a coat every year with the UV-protecting varnish.
One can cover 25 sq. ft. on non-porous surfaces, hope that information will help you when you to order, so you can get the right amount of protective UV.
I have a lot of sun-powered lamps in my garden, I love them all, they are in different sizes, shapes and forms, some are years old, but I normally buy new every year, but if they should go a bit milky then they are easy to clean, if you would like to know how, then go here and if you have other questions go here.