[Q]: Objective: To paint cardboard and make it shine, you can
[A]: Use metallic poster paint

[Q]: Objective: To bake the cheesecake batter.
[A]: Put the cheesecake batter in a baking dish. Place the baking dish on a pan with hot water into the oven at 350 F and bake for 1-2 hours.

[Q]: Objective: Eliminate gunk from garden shovel.
[A]: Spray WD-40 on shovel and scrub with rag.

[Q]: Objective: To cut a piece of metal rod to the size of a ring, you can
[A]:
Use a bandsaw