Explain the result when aluminum is placed between the liquid and the wick

The wick merely transports some of the liquid up to where vaporizes.It is not part of reaction but it does affect the reaction rate greatly,so it is a sort of catalyst in that time.if you wrap the wick in the aluminum it will block the transport the wax and it will wither go out less or brightly

The gas would begin to expand, and eventually the can would burst or explode.