Griot's Garage G9
A forgiving, well-supported first polisher with a lifetime guarantee, for owners new to machine polishing.
Amazon $179.99$179.99
The Griot's Garage G9 is the better dual action car polisher overall, rated 3.5 to 2.7. The Griot's Garage G9 leads on warranty, power and features. The Maxshine M312 3-Inch wins on correction. The Griot's Garage G9 costs $19 less ($179.99 vs $198.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Maxshine M312 3-Inch
A compact 3 in polisher for mirrors, pillars and bumpers, as a second machine beside a full-size one.
Amazon $198.99$198.99
Which should you buy?
- Choose the Griot's Garage G9 for warranty (lifetime guarantee against defects vs 1-year warranty), power (1,000 W vs 550 W) and features (constant-speed electronics vs none of the listed features).
- Choose the Maxshine M312 3-Inch for correction (12 mm orbit vs 9 mm orbit).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every corded short-throw dual action car polisher; a clear win is highlighted. How we rank explains each one.
| Factor weight | Griot's Garage G9 | Maxshine M312 3-Inch |
|---|---|---|
| Overall rating | 3.5/5 | 2.7/5 |
| Correction 30% | 25 9 mm orbit | 44 12 mm orbit |
| Value 25% | 67 $179.99 | 62 $198.99 |
| Warranty 15% | 100 lifetime guarantee against defects | 0 1-year warranty |
| Power 10% | 86 1,000 W | 21 550 W |
| Weight 10% | 50 weight not published (neutral score used) | 50 weight not published (neutral score used) |
| Features 10% | 30 constant-speed electronics | 0 none of the listed features |
Specifications
| Griot's Garage G9 | Maxshine M312 3-Inch | |
|---|---|---|
| Polishing | ||
| Orbit diameter | 9 mm | 12 mm |
| Speed range | 2,000-6,400 OPM | 2,000-5,500 OPM |
| Backing plate | 6 in | 3 in |
| Forced rotation | No | No |
| Power | ||
| Power source | Corded | Corded |
| Motor rating | 1,000 W | 550 W |
| Cord | 10 ft, detachable | - |
| Brushless motor | Not listed | Not listed |
| Controls | ||
| Constant-speed electronics | Yes | Not listed |
| Soft start | Not listed | Not listed |
| Lock-on trigger | Not listed | Not listed |
| Build | ||
| Pads or polish included | No | No |
| Warranty | Lifetime | 1 year |