12,000 Grit Sub Micron Aluminum Oxide Polish - Extreme Finish

In this review the focus is on a specialist polishing refill for rock tumblers and finishing work, aimed at users who demand an ultra-fine final polish. The bottom line: this 2 pound bag of 12,000 grit sub micron aluminum oxide is best for people who need a superior final-stage shine and consistent, very fine abrasive performance. It is neither a beginner bulk media nor a coarse grit; rather it is a precise finishing polish intended to outperform coarser 1,200 or 1,500 grit alternatives.

Key Features

• Ultra-fine 12,000 grit: Delivers a much finer abrasive than common 1,200 or 1,500 grit polishes, producing a smoother final surface for stones and metal.
• Sub micron aluminum oxide: The sub micron particle size helps reduce visible scratches and improves reflective shine when used as a final polish step.
• Two pound quantity: Provides a substantial refill supply for multiple polishing runs or larger batches without frequent reordering.
• Designed for final polish: Formulated specifically to be used as the last stage of tumbler finishing to maximize gloss and surface clarity.
• Veteran and disabled owned: Sold by a disabled and veteran owned company, which some buyers will value when choosing a supplier.

Who It's For

This product is aimed at hobbyists and small-shop finishers who already use tumblers and need an effective final polish step for agates, jaspers, metals and other materials that benefit from a very fine abrasive. It suits anyone seeking a noticeably finer result than common 1,200 grit or 1,500 grit options.

It is not an all-in-one media for rough shaping or rapid material removal; users who need heavy stock removal, initial tumbling grits or a complete multi-stage kit should look elsewhere and pair this polish with coarser media for earlier stages.

Pros & Cons

Pros

• Produces a finer surface than typical 1,200 or 1,500 grit polishes, making it ideal for final-stage shine.
• Sub micron aluminum oxide formulation minimizes visible scratches at the end of the polishing process.
• Two pounds is a convenient refill amount for consistent polish supply over several runs.
• The product comes from a disabled and veteran owned company, adding supplier credibility for some buyers.

Cons

• Some users report mixed results on sheen-while many achieve a bright shine, others see a more matte finish depending on material and process.
• This is a finishing polish only and will not replace coarser grits needed for earlier tumbling stages.

Specifications

Product weight	2 pounds
Abrasive type	Aluminum oxide
Grit	12,000 grit (sub micron)
Intended use	Final stage polishing for tumblers and finishing
Manufacturer	MJR Tumblers (disabled and veteran owned)
Formulation benefit	Extreme polish for superior finish

Our Verdict

For experienced tumblers and finishers who prioritize the final surface quality, this 12,000 grit sub micron aluminum oxide polish is a strong choice and represents good value as a dedicated finishing product. Pair it with appropriate coarser grits for the earlier stages, and expect the best results on materials that respond well to ultra-fine abrasives.

Frequently Asked Questions

Is this polish suitable for the final stage of tumbling?
Yes. It is formulated as an extreme final polish to be used after coarser grits have completed shaping and smoothing.

Will this replace 1,200 or 1,500 grit products?
No. This 12,000 grit is much finer and intended for finishing; coarser grits are still required for initial and intermediate stages.

How much product is included?
The package contains 2 pounds of 12,000 grit sub micron aluminum oxide polish, suitable for multiple polish runs.