Here is a recipe I got off another web site, that works beautifully
with my bundt pans and other baking pans used for cakes etc. I mixed it up, put it in a Lock and Lock container and keep it in the fridge.
PROFESSIONAL BAKING PAN COATING
1 cup shortening, I used Crisco butter flavor
1 cup corn oil, I used Canola oil
1 cup all purpose flour
Combine in a mixer. Store in an airtight container in cool cupboard of in refrigerator.
When ready to use, apply liberally to pan/pans with a pastry brush. No need to follow up with a flour sprinkling.
NOTE: I even use this on my silicone pans when I use them.
Hope this helps.