The physics of adhesion is real, but so is the power of persistence. If you're patient and apply gradual pressure, the cylinder will eventually give—especially if you're willing to get a little messy in the process.
Discussion
The viscosity and cooling of the butter-banana mix create a sort of makeshift glue, but if the cylinder is metal, it's still possible the butter and banana mixture could create a strong enough bond to resist even gradual pressure.