The SUV did come out looking great!
The Porter Cable 7424xp
is a great machine but in my opinion 6 1/2" diameter pads are just too big for it and many of the other machine of this type as well.
Two machines not part of this group are; the Flex 3401
and the Makita's BO6040
which is the new kid on the block.
and the Makita
both have forced rotation which means you no longer need to worry about the balance between friction and downward force to ensure that the pad continues to spin.
This is an article I wrote and posted several times.. Pad Sizes
The 6 1/2" diameter pads a Porter Cable 7424
pushes the limit of the machine and this could be part of the problem.
I have this machine and found a world of difference when I decided to try Lake Country 5 1/2 diameter pads.
The Porter Cable 7424
style dual action polisher should come standard with 5 1/2 inch pads and corresponding backing plate. Pads & Friction
The size or surface area does not directly affect the frictional force between two surfaces until downward force or pressure is applied. Reducing the pad size will only improve the mechanical efficiency of the machine.
The motor of your polisher produces some amount of power. The larger the pad surface area the harder the motor must work. Now, most will say "it's only 1 extra inch", but when it comes to surface area and friction you’re really talking about an additional 10 square inches. Now take a look at the difference between the 5 1/2", 6 1/2" and 7" pad...........Size does matter
Surface Area - 5 1/2 pad = 23.75 in˛
Surface Area - 6 1/2 pad = 33.18 in˛
Surface Area - 7 pad = 38.484 in˛
There is a direct relationship between the pad surface area and the polishers ability to transfer adequate power to the pad improving its overall performance.
I have the Porter Cable 7424 first generation which has less power than the current generation. It has little problem handling the smaller size pads and this is what I recommend to anyone who uses this style of machine.
The Flex 3401 is priced at nearly $400 and the Makita BO6040 comes in second place at $300 so neither of these machines are cheap by any means.
I haven't tested the BO6040 but I do have the Flex 3401 and it is the best dual action machine on the market today....my opinion of course...