I don't know much...

But I know a lot about tan. Just between friends I've considered buying a spray tanning machine. Just for home use.
My friend recommended this. She was seriously glowing.
I've tried it for 5 days now and so far no streaks. Its the best self tan I've ever used - hands down.
Just in case you were in the market for one.

Palmer's coco butter Natural bronze tanning moisturizer. I got mine from a chemist.