Which polisher next? Rotary Polisher or Gear-Driven Orbital?

[Mike Phillips]

Which polisher next? Rotary Polisher or Gear-Driven Orbital?

Always happy to help
I get a lot of questions about car detailing via email and/or all the different types of ways we communicate on social media platforms like YouTube, Facebook and Instagram.

I never mind answering people, but with email, only ONE set of eyeballs see the answers. Yet we all know, if one person has a question, it's highly likely other people have the same question. So, in order to LEVERAGE my typing time, (I'm on the clock so there must be a benefit to the company), I simply answer questions on this forum. PLUS - Google does a GREAT job of analyzing the content on this forum and then ranks it high in the search results. So helping one person, ends up helping a lot of other people and that's what I'm all about.

Here's a recent question from email.

From: M
Sent: Monday, December 8, 2025 9:42 AM
To: mike@drbeasleys.com
Subject: Polishers

Hi Michael,

Thanks again for the recommendation. I’ve been really enjoying the G9 along with the EdgeGuard pads. My experience with the pads was a bit mixed, but I liked the bumper design, and I’ve had great results with the Griot’s BOSS pads. I’ve actually liked the polisher so much that I picked up the G8 as well and 3'' EdgeGuard pads are a good match for the machine.

Since I’m just a weekend warrior, I wanted to get your take on what makes sense as a next step. Would it be worth investing in Harbor Freight’s Hercules DA forced-rotation machine, or is it smarter to spend some time learning a rotary instead? I don’t have a specific job in mind. I’m mostly planning ahead for the winter downtime and trying to think about what skill or tool would help me progress.

Thanks again for pointing me in the right direction. Feel free to point me to any of your video materials, as I enjoy watching them and learning.

Thank you,
M



Great question! Touch choice too as I use both of these tools all the time. Which tool I use just depends upon the job.

For example,

Rotary Polisher
When removing sanding marks, sanding cloudy headlights, machine scrubbing tires or anything, I grab my favorite cordless FLEX rotary polisher.

Gear-Driven Orbital
Anytime I need to do a heavy paint correction, especially on a curvy car, if I don't need to start with a rotary polisher, (because the paint is so hammered), then I reach for an 8mm gear-driven orbital polisher. My go-to choice is the FLEX Supa Beast, as it is the most refined model for this type of polisher plus the optional 6" backing plate fits Buff and Shine EdgeGuard foam pads perfectly.

My recommendation would be to get the Hercules Forced Rotation Dual Action Polisher first and then add a cordless rotary next.


Hercules FRDAP = Hercules Forced Rotation Dual Action Polisher


The Hercules FRDAP is a great copy of the original FLEX XC 3401 VRG except like the original BEAST, the HF version comes with an exact copy of the factory backing plate and this is a 5.5" backing plate. Not a big deal, but it doesn't fit SNUG into the back of the 6" Buff and Shine EdgeGuard foam buffing pads. Not a deal breaker, but there is an appreciable difference. The key thing with gear-driven orbital polishers is to make sure the velcro on the backing plate is tuned or matched to the velcro on the buffing pads you buy. You NEED good attachment strength or the pads can walk-around on the backing plate and even fly off. This is where the plastic liner on the back of the Buff and Shine EdgeGuard pads helps to overcome this problem.

And sad to say, the 5" EdgeGuard pads will not fit on the 5.5" backing plate on the Harbor Freight Hercules Forced Rotation Dual Action Polisher. So you need to use the 6" or switch to a different brand of pads. Just make sure the pads attach securely and YES there are different type of hook-n-loop, i.e., velcro. Especially if you work these polishers super hard. The Hercules FRDAP also doesn't have the 7-fucntion microprocess like all FLEX polishers, but again, not a deal breaker. (See pictures below)


Why?

Gear-Driven Orbital Polisher
With the gear-driven orbital polisher, you have a tool that simply doesn't care the shape of the body panel being buffed, the pad is going to rotate and oscillate no matter what. There is ZERO pads stalling issues and thus zero wasted time and thus zero brain drain. Just commit to investing the time behind the buffer as I like to say, as this is how you get GOOD at using these types of tools. Don't be like some of the talking heads, online detailing personalities that skip over the power these tools have and simply focus on how they're not as smooth as free spinning, random orbital polishers.


Rotary Polisher
What can I say, this is without a doubt, one of the most versatile tools you can have in your arsenal. Like a gear-driven orbital, you'll want to invest the time behind the buffer in order to be come good with it. But also like I say, if you spend enough time behind any polisher, you can make it dance on paint.

And when it comes to cordless tools, the rotary is the tool that really excels in the cordless category. All the power of a corded tool but without out the hassle of managing a power cord. Also, I do a LOT of wet work using cordless rotary polishers and because their cordless, there's no shock risk.





I'm not sure if the above helps but that's what I got.


Mike

 

[Mike Phillips]

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Here's some pictures that do the talking about the plastic liner on the back of the Buff and Shine EdgeGuard pads and how they fit on different size backing plates.


The Harbor Freight Hercules Forced Rotation Dual Action Polisher has a 5.5" diameter backing plate. An exact dimensional copy of the FLEX BEAST backing plate.

Here's the 6" Buff and Shine EdgeGuard buffing pad with the plastic liner that helps to center the backing plate, protect paint from the edge of the backing plate and it also helps the pad from moving around on the backing plate under hard use.

With EdgeGuard, you have the option for 3", 5" and 6" pads. The 6" is the only one that will work with the Hercules Forced Rotation Dual Action Polisher and because the backing plate is smaller than the inner diameter of the back of the EdgeGuard 6" pads, there's a gap between the plastic liner and the backing plate. this is wiggle room and what can/will happen is the foam pad will move around on the backing plate and this will show up as a dramatically out-of-balance pad on backing plate.

Here's shot looking down on the backing plates on to different, but similar tools. The Hercules Forced Rotation Dual Action Polisher and the FLEX Supa BEAST.

See the gap?

Again, not a deal breaker but one thing I know for sure, the larger 6" backing plate on the newer FLEX gear-driven polishers is a perfect fit into the back of the EdgeGuard pads and this make them more secure in their attachment which comes in handy if you do a lot of extreme detailing with these types of tools.


Mike

 

[Mike Phillips]

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The Harbor Freight options will work and are a good fit for weekend warriors. For professionals, though, I would whole heartedly recommend spending more money and getting pro-grade tools.

Here's a comparison of Harbor Freight options and my go-to polishers from FLEX.


Harbor Freight cordless rotary, FLEX cordless rotary polisher, Harbor Freight copy of the BEAST and the Supa BEAST, a lighter, quieter, cooler and smoother version of the original BEAST.

Prototype FLEX PE-150
This prototype was given to me in 2017, about a half year before they were launched at SEMA. My biggest mistake is not tracking how many cars and boats I've buffed out with this polisher. And in case you didn't know, normally prototypes are rough versions for the final product. That is to say, normally you would not expect them to hold up over time, but this polisher just keeps on churning and turning.

Hand built in German, see the two different colors of plastic? That's a sign of a prototype.

No tool serious number - a sign of a prototype tool.

To power-up, I'm using the FLEX 24 volt to 18 volt adapter and then I have the whopping 12 Amp Stacked Lithium Ion Battery attached. Plenty of run--time.

At the end of the day, I don't sell tools, so get the tools that work best for your budget and your style of detailing.

Mike

 

[Mike Phillips]

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Here's my article on the FLEX 7-Function Microprocessor

The 7-Function Microprocessor Inside all FLEX Polishers by Mike Phillips

 

[Mike Phillips]

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Here's the link to my blog article review, with video embedded, for the Harbor Freight Forced Rotation Dual Action Polisher.

Review: Harbor Freight Forced Rotation Dual Action Polisher

 

[Jeffb]

Thanks for the info. Presently have a Griots G9 and am thinking of adding the Harbor Freight Forced Rotation as have been asked to do a large SUV and Van by family members.
After reading review, checked the Harbor Freight Web site and there is a 5” backing plate offered.

Plan to order if I purchase to try as I have existing 5” pads and plan to order some 5” Buff & Shine. Will report back after ordering.

Due to Indiana weather, most likely no detailing till Sprimg!

 

[Mike Phillips]

Thanks for the info. Presently have a Griots G9 and am thinking of adding the Harbor Freight Forced Rotation as have been asked to do a large SUV and Van by family members.
After reading review, checked the Harbor Freight Web site and there is a 5” backing plate offered.

It's a great option for anyone wanting to avoid pad stalling.

Plan to order if I purchase to try as I have existing 5” pads and plan to order some 5” Buff & Shine. Will report back after ordering.

To be honest, I've never check pad fitment of the 5" Buff and Shine EdgeGuard pads onto the optional 4 3/8" FLEX backing plate. I'll check and get let you know what I find out.

Due to Indiana weather, most likely no detailing till Spring!

Copy that, reminds me to stop off at the store and pick up some more SPF 50 Sunblock as we ran out hanging around the pool through the Christmas Holiday.