I have the DAS 6 pro ( which is the GG in this part of the world) and have had no issues with 6.5 inch pads. I use the 5.5 inch pads on curvier cars/panels and the 6.5 ones on the flatter ones.
I use 5.5 pads for everything but finishing waxes. Just find it easier with 6.5 as it spreads the product more evenly I feel and in a larger surface area.
When it comes to dual action polishers like the Porter Cable,
Thin pads rotate better than thick pads.
Smaller pads rotate better than larger pads.
DRY pads rotate better than wet pads.
Holding the pad flat to the surface is also vital for good pad rotation.
The longest portion of any full detail project is the correction step. This is the step where you're going to run the buffer SLOWLY over the paint, buffing ONLY SMALL SECTIONS at a time.
For the average size car this will take about 4-6 hours for someone that knows what they are doing and longer for someone learning this craft.
Having enough pads to switch over to a clean, dry pad after buffing out a single panel will make the job not only take less time but the abrading or correcting of the paint will be more effective because as pads become wet with product their aggressiveness diminishes.
The Griot's definitely has the power to spin the larger, thicker pads as long as they are dry but all dual action polishers modeled after the Porter Cable will work better with thinner, smaller diameter pads.
Wrote this a few years ago.... one of the most common articles I share....
I don't have too much experience, but I have used the 6.5" pads without any problems keeping them spinning. I have switched to the 5.5" Meg's DA system and it does work much quicker.
When I first bought everything and not being totally up to date on things, I got 6.5" pads for my unit. I will say, my 290lb body leaning on this thing barely made it stop. I have since switched my 6.5" pads to 5.5 on the GG, my 6.5" pads went to the flex.
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