To make polypropylene rope sandals, you'll need a few supplies: polypropylene rope suitable for footwear (about 10-20 feet, depending on shoe size and design), scissors, a lighter, and a sturdy needle. Start by measuring the length of rope you'll need for each sandal by loosely wrapping it around your foot in the desired design, leaving extra for adjustments. Cut the rope and carefully melt the ends with a lighter to prevent fraying. Begin forming the base of the sandal by looping the rope around the sole of your foot, adjusting for comfort and fit. Use simple knots or braiding techniques to secure the ropes in place, ensuring they're tight enough to hold the shape but not so tight that they're uncomfortable. Continue wrapping and knotting the rope around your foot, securing each pass with stitches using the needle if necessary, until the sandal is as covered as you like. Finish by cutting any excess rope and searing the ends. Customization options include mixing rope colors, adding beads, or using different knotting techniques for unique designs.

Epoxy resins can be FDA approved for certain applications that involve contact with food. The FDA's Code of Federal Regulations (CFR), specifically 21 CFR 175.105 and 21 CFR 175.300, outlines conditions under which epoxy resins may be safely used in coatings or components of coatings for food packaging or utensils. However, not all epoxy resins automatically meet these criteria; it depends on their chemical composition and intended use. Manufacturers must ensure their epoxy product complies with these regulations for it to be considered FDA approved for food contact. Always look for explicit confirmation of FDA approval when purchasing epoxy for such applications.

To list services in Yarn, which generally refers to managing application packages in the context of Node.js and not direct service management, you can use commands related to the packages and scripts defined in your `package.json`. Services in the typical "service management" frame don't apply to Yarn directly. However, if you're interested in viewing scripts that can be executed which might be akin to service actions, you can utilize the `yarn run` command. Running `yarn run` alone will list available scripts defined in your project's `package.json` file. This is useful for understanding what tasks, such as starting, building, or testing your application, you can perform with Yarn in the context of your project. Remember, each script in your `package.json` can be executed using `yarn run ` to perform specific package tasks or services you've defined for your project.