My two cents if I may…..
It’s great that you will tackle this project as a winter project, since it’s a project and the winter usually lasts a while. This will allow you to work at a slow pace by panels. You have purchased the tool, the porter cable, while there’s other brands of machines on the market I’m sure that you will find the results very rewarding.
As the book said,”Theres many ways to skin a cat” so I’m taking the liberty to provide some input and steps that have worked for me in the past.
Some of the most common ways to induce swirl marks onto your surface:
1- Automatic Car washes
2- Wrong type of Microfiber towel
3- Wrong type of wax product.
4- Wrong type of pads
5- Wrong type of machine
6- Harsh polishing compounds
7- Not keeping your wash mitt or sponge properly rinsed.
8- Wiping down a dusty or dirty car with a dry towel.
9- Towels and applicators containing polyester threads.
10- A dirty chamois or a chamois that has not been properly maintained
11- Using a car cover when the car or the cover is not clean.
12- Wrong type of shampoo
The first thing will be to wash the car, since this is going to be a project, I suggest we start from ground zero, removing all of the previous wax from the surface. It’s extremely important to do this since there’s many ways to do so, via clay bar or similar product, there are companies that sell a product just to remove the car wax or the conventional way that so many people praise, which the product manufacture is against doing so the dishwashing wonder soap product.
Once we have dried the vehicle our next step is to evaluate the condition of the surface we are going to work with. If the vehicle is outside with direct sun light you should be able to see that some areas are worse than others and if the vehicle is inside the garage you may need the aid of additional lights to pinpoint the more severe areas. In either way, once you have located them, take a small piece of “painters tape” cut a small piece and place on the affected area, this will help as a guide of the areas that will need more attention.
Sample of swirl marks under the direct sun light.
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Sample under the lights
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Next step will be to wipe the entire surface with Isopropyl alcohol (IPA) a mix of 50/50 alcohol/water mixture to remove waxes and oils prior to start our work.
Next we want to tape delicate areas, things like emblems, plastic trim etc, the purpose for doing this is to avoid any contact between the pad and that surface which can damage the pad the surface or both. I like to use 1 inch and 2 inch painters blue tape.
Sample of taping.
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Next we need to figure out what pad (s) we will use. Since we will be working with the Porter Cable the most suitable pads will be foam pads.
The most common colors in the industry are;
Yellow Foam Pad- Use for Heavy duty Compound
Orange Foam Pad- Use for Light duty compound
White Foam Pad- Use for Polish
Green Foam Pad- Use for Compound/Polish
Black Foam Pad- Use for machine Glaze
Blue Foam Pad- Use for Polish/Sealant
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Next we will need the product of your choice, depending on the condition and severity of the swirl marks more than one product may be needed, most of the time you can start with a good quality Swirl Remover and from there step up to a compound if needed.
Few samples of what I have been able to accomplish with foam pads and Swirl remover, one of the most important steps is the pad selection, as an example if you start with an orange foam pad and you don’t see good results then try with a yellow foam pad, it may take you a few steps to find the correct combination but don’t get frustrated.
Before
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After
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Before
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After
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From here we can start the process
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Swirl Remover works best when applied with a polisher. Polish with a light cutting pad on your Porter Cable 7424 dual action polisher. Start at a speed of 5 and use moderate pressure to go over a 2 x 2 sq. ft. area. Work up and down, then side to side to ensure optimum coverage. Buff using a Microfiber Towel.
Some general guideless
Prior to turning the polisher on, ensure that the buffing pad is in contact with the surface and Before lifting the machine from the surface make sure the machine is off.
With new pads I like to spray a mist of detailer into the pad
Choose your product to be in use.
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Apply 3 dime size dots to the pad surface (In this case I was working with larger areas so I used 3 quarter size dots.)
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Work on small sections at a time. We like to work on 2x2 areas
Overlap the passes you can use the product as a guideline
Move the machine across surface slow
Settings, I like to start at 4.0 and eventually get to 6.0, usually between 5.0 and 6.0 you will get good results, I work a lot with the setting at 5.0 and at times at 4.0 moving very slow.
You may want to run the electrical cord through your shoulder if you are standing up to avoid any contact with the surface.
Have plenty of quality micro fiber towels available.
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Place one hand on the top of the machine and hold the pad flat to the surface and apply firm downward pressure 15 to 20 pounds of pressure.
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Wipe product residue with a Microfiber towel. Fold the towel in 4-ways with aims to always have a clean side.
Clean you pad as you go, I like to clean mine after each panel. Depending on the product you have, you may have todo it more often as some products produce more dust build up than others.
You may need to repeat the steps depending on the condition of the surface, if all that fails then there’s a need to step to a more aggressive compound.
Sample of black cars that we have been able to do with the above describe procedure.
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I hope this helps,and remember,it’s NOT the Arrow, it’s the Indian that makes the successful catch.