I grease them up with shortening. I haven't had much luck using flour. Seems to stick more for me and get darker than I like. Haven't tried Wilton's quick release. I'd be curious to know how well it works.
I use the wilton quick release, I thin kit works great. I ALWAYS buy it at Michaels or Hobby Lobby with a 40% off coupon
I use the homemade stuff myself. I love that I can make a little bit using a 1/4th of a cup each of flour, crisco and oil or I can make a big bowl using a cup of each.
I store it in a plastic bowl with a lid on the kitchen cabinet. To use it, just brush it on with a pastry brush.
I also use the homemade stuff and love it. No problems with it showing white on chocolate cake either. I mix 1 cup shortening, 1 cup flour, and 1 cup of oil. Mix well and coat pans lightly. I haven't had anything stick. I can't afford the commercial spray. Too expensive.
I use Bakers Joy.. $1.88 per can. I just dont have the patience to wipe the pans with crisco, then flour, then shake... I sparay the pan and I'm done... Can't get easier than that! 
I spray the sides with Baker's Joy and put parchment paper in the bottom. Cake comes out clean every time.
I use the homemade mixture also. No overspray, I always have the ingredients on hand if I run out and it doesn't go bad once I make it. I use a pastry brush and brush the sides of the pan and then put parchment paper in the bottom so I don't have to worry about sticking.
NEVER had a problem with doing it this way.
I spray the sides with Baker's Joy and put parchment paper in the bottom. Cake comes out clean every time.
This is exactly what I do too. Works like a charm!
Just wanted to thank those who were using the homemade version. I started using it a few weeks ago after reading about it here and I LOVE it. There is no messy overspray, and it cleans up from the pans so much easier than the sprays and other oils.
Thanks! 
Before Wilton marketed their cake release (which does work) they included a recipe for a cake release in their old course 1 book. It was equal parts AP Flour, vegetable oil and shortening. I store mine in the fridge- but you don't have to. I never use anything else!!!!
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