I want to hide the nail head in some molding that I am installing.

Use a nail set to sink the nail head into the molding. Then you can fill the hole with a spackling compound, sand it smooth and paint it.

Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.