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View compareFrequently Asked Questions
- Q: What is the size of the GemFoam rock tumbling media? A: The GemFoam rock tumbling media is medium-sized, measuring four point seventy-two inches in length, one point eighteen inches in width, and seven point twenty-eight inches in height.
- Q: What materials are used to make GemFoam? A: GemFoam is made from foam, designed specifically for rock polishing. It is safe and effective for improving the shine of tumbled rocks.
- Q: How many times can I reuse GemFoam? A: GemFoam can be reused for up to six rock polishing cycles. This makes it a cost-effective choice for multiple tumbling projects.
- Q: How do I use GemFoam for rock polishing? A: To use GemFoam, add it to your tumbler after the final grit cycle along with water and the rocks you want polished. Tumble for up to three days for optimal results.
- Q: Is GemFoam suitable for all types of rock polishers? A: Yes, GemFoam is compatible with any durable rock polisher. For best results, it is recommended to use it with National Geographic tumblers and rock tumbling supplies.
- Q: Can I use GemFoam with different types of rocks? A: Yes, GemFoam works effectively with a variety of rocks and minerals. It enhances the shine regardless of the rock type used in tumbling.
- Q: How should I store GemFoam when not in use? A: GemFoam should be stored in its convenient reusable mesh bag. This helps keep it organized and ready for your next tumbling project.
- Q: Is GemFoam safe for children to use? A: Yes, GemFoam is safe for children to use, as it is part of the National Geographic STEM series. However, adult supervision is recommended during use.
- Q: How do I clean GemFoam after use? A: To clean GemFoam, simply rinse it with water after use and allow it to air dry. This will help maintain its effectiveness for future polishing.
- Q: What should I do if the rocks don't shine as expected? A: If the rocks don't shine as expected, ensure you are using the correct amount of GemFoam and tumbling for the full three days. Adjust your process if needed.
- Q: Does GemFoam have a warranty? A: Yes, GemFoam is backed by a satisfaction guarantee from National Geographic. If you're not satisfied, contact the manufacturer for assistance.
- Q: Are there any hazardous materials in GemFoam? A: No, GemFoam does not contain any hazardous materials. It is designed to be safe and effective for rock polishing.
- Q: Does GemFoam come with any additional supplies? A: Yes, GemFoam comes with a reusable mesh bag for easy storage. This adds convenience to your rock tumbling supplies.
- Q: Can I use GemFoam with other polishing grits? A: Yes, GemFoam can be used after any polishing grit cycle to enhance the shine of your rocks. It complements your tumbling process.
- Q: What is the best way to maximize the use of GemFoam? A: To maximize GemFoam's effectiveness, follow the instructions provided, use it in conjunction with quality tumbling grit, and ensure proper tumbling time.

