Amazon.com.au:Customer reviews: Starter Rock Tumbler Kit for Kids– Includes Rough Gemstones, Polishing Grits, Jewelry Fastenings, and Instructions – Great STEM Science Kit for The Future Geologist, Boys and Girls Ages 8+
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This is a great rock tumbler. It hasn’t leaked at all and we’ve run it several times. We did find that you have to let it dry completely before using the polishing powder. We made the mistake of letting it get mostly dry and the powder stuck to the sides of the tumbler and to the rocks themselves. My 8 year old daughter has loved using this kit to make her own gems.
We purchased this to tumble and polish rocks my children have been collecting. We stared with the rocks that were included in the kit. The tumbler works well and isn’t as noisy as other tumblers. But we are disappointed to find out the rocks we have been tumbling for 3 weeks won’t shine with the powder included in this kit. We were also disappointed that this tumbler can only tumble very small amounts of small rocks.
The tumbler is well made, easy to handle, and DOES NOT LEAK. The tumbler has provided hours of fun for our Grandchildren as they watch the progression of the gemstones from angular pieces to those with rounded edges and eventually polished. Our Granddaughter has made several rings from the finished stones and loves to tell all about the process. She has learned about erosion and the effects of water and friction upon the stones. The machine does make some noise from the tumbling process, they all do, and I build a small wooden box (10" x 11" x 8") with a cutout in the back for the AC adaptor and it dramatically reduced the noise to a whisper. Great product, easy for children to handle and a nice teaching/learning tool. FIVE Stars...Cheers, BlueWaterSailor