The throw (or orbit) is the diameter of the pad’s orbital movement as it spins. The larger the throw, the more paint surface the pad covers during each revolution. Larger throws generally increase correction speed but reduce maneuverability.

3mm Throw

Primary Use:

• Piano black trim
• Interior gloss plastics
• Motorcycle parts
• Very tight areas

Pros

• Extremely precise
• Almost impossible to stall
• Great for intricate work

Cons

• Very slow
• Not practical for complete vehicles

Best For

Professional detailers who want a dedicated mini polisher.

8mm-9mm Throw (Traditional DA)

This is what Porter Cable machines popularized years ago.

Pros

• Very forgiving
• Excellent control
• Works well on curves
• Great finishing ability

Cons

• Slower paint correction
• Requires more passes

Best For

• Beginners
• Hobbyists
• Applying waxes and sealants
• Light polishing

12mm Throw

A nice compromise between the old-school 8mm and the newer long-throw machines.

Pros

• Faster than an 8mm
• Still very controllable
• Great for one-step polishing

Cons

• Doesn’t cut as fast as a 15mm

Best For

• Weekend enthusiasts.

15mm Throw (My Favorite Overall)

If someone asked me to own only one machine…

I’d pick a 15mm.

Why?

It is the best balance of:

• Speed
• Correction ability
• Maneuverability
• Finish quality
• Comfort

It works exceptionally well on:

• Sedans
• Coupes
• SUVs
• Pickup trucks

Pros

• Fast correction
• Great finishing
• Handles curves well
• Easy to control
• Can use 5-inch pads
• Less likely to stall on body lines

Cons

• Slightly slower than a 21mm on huge panels

Best For

• Professional detailers
• Mobile detailers
• Ceramic coating installers
• Paint correction specialists

This is why so many professional detailers consider the 15mm the “Swiss Army knife” of DA polishers.

21mm Throw (Long Throw)

This machine is built for production speed.

Pros

• Covers much more paint
• Cuts faster
• Less time polishing hoods
• Excellent for roofs
• Excellent for truck sides

Cons

• Sometimes more challenging to control
• Doesn’t like sharp curves
• Can stall easier on complex panels
• Typically uses a larger 6-inch backing plate

Best For

• Production detailing
• High-volume shops
• Large SUVs
• Vans
• Trucks
• Fleet vehicles

If you’re polishing large flat panels all day, the 21mm will noticeably reduce polishing time.

21mm vs 15mm

Feature	15mm	21mm
Paint Correction Speed	★★★★☆	★★★★★
Finishing Ability	★★★★★	★★★★☆
Curves & Body Lines	★★★★★	★★★☆☆
Large Flat Panels	★★★★☆	★★★★★
Beginner Friendly	★★★★★	★★★☆☆
Overall Versatility	★★★★★	★★★★☆

What We Use at Detail Czar

Based on our training curriculum and the variety of vehicles our students work on, many say our current approach is ideal.

For a three-day certification program, we students that:

• 15mm DA = The primary machine they should purchase first. It is versatile, forgiving, and capable of producing professional results on nearly every vehicle.
• 21mm DA = An excellent second machine once the student is consistently performing paint correction and wants to increase efficiency on larger vehicles.
• 3-inch DA = The finishing tool for bumpers, A-pillars, rocker panels, mirrors, spoilers, and other tight areas.

This three-machine setup allows a professional detailer to handle virtually any paint correction job efficiently.