Can you use the Porter cable 7424 to

Spawne32 said:
compound a car after cutting it with 2000 grit? If so...what pad would you use? wool, or foam.
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Yes I used a LC orange and Meg. # 83 that is a mild combo and it took awhile but yes it can be done.
The pros use a rotary because it is fast and to them time is money but if you are a hobbyist just use what you have unless you are talking about the entire car.
If you painted the whole car rent a rotary from a tool place.
PC will work it is just slower.
 
After rereading your post it sounds like you did the whole car you did not make that to clear but if you did the entire car the answer is still the same.

Time to do a door with a rotary and a wool pad about 2 minutes with a PC and a foam pad 30 to 45 minutes.
 
Wool pads are not recommended for random orbital machines (Porter Cable 7424, etc) as wool pads nap / fibres works more efficiently with a centrifugal motion as opposed to centripetal force, they also have more frictional resistance than a 7424 can overcome due to the limited torque available

1. If the nap (fibres) of the wool pad is longer than the eccentric offset (stroke) of the random orbital polisher the effective transfer of energy will be lost
2. Foam cutting pads tend to be much’ stiffer’ than wool fibres and thus will transfer the movement of the machine to the paint surface more efficiently than a comparable wool pad on an orbital polisher
 
black bart said:
After rereading your post it sounds like you did the whole car you did not make that to clear but if you did the entire car the answer is still the same.

Time to do a door with a rotary and a wool pad about 2 minutes with a PC and a foam pad 30 to 45 minutes.
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yeh it was just painted, its got some orange peel, definitely needs to have that corrected to bring out the shine.
 
Spawne32 said:
I have a PC. I own a broken rotary, i have access to one if needed. Have i ever done this before? No.
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If you have experience with a rotary then that would be what I would start with then if you have any buffer trails and you probably will use the PC to finish to the gloss that you want.
Rotary is WAAAAAaaaaaayyyyyyyy faster than a PC :)

If you don't have much experience with a rotary keep speed down to no more than 1200 rpm or less and stay away from edges, you can get those with the PC better safe than sorry.
If you don't keep your hands moving a rotary will burn paint in a heart beat.:eek:
 
Spawne32,

I agree with blackbart and the short answer to your question is yes. I have used Meg's 105 with an orange pad and the Kevin Brown Method to achieve amazing results and far more cutting and polish ability than is normally available with just a PC and compound/polish via the traditional method. I've also achieved decent results with exerted pressure, slower passes and repeated passes using the more traditional methods and sometimes with a yellow 5.5" LC pad. While a rotary IS substantially more effective (i.e. quicker), a PC can be worked more effectively than many think and can remove at least 2000 sanding marring. That's my experience anyway.
 
The KBM also involves spritzing with water after a couple of passes of the pad and M105 i.e. at the midpoint of that section's pass. That, to me, is the essential part because it results in what is similar to a wetsand effect of the polish and recirculates more of the abrasives that you've previously worked into the pad.

I've seen videos of the "Kevin Brown Method" and some DON'T include the water spritz. THAT'S NOT IT COMPLETELY.
 
togwt said:
Wool pads are not recommended for random orbital machines (Porter Cable 7424, etc) as wool pads nap / fibres works more efficiently with a centrifugal motion as opposed to centripetal force, they also have more frictional resistance than a 7424 can overcome due to the limited torque available

1. If the nap (fibres) of the wool pad is longer than the eccentric offset (stroke) of the random orbital polisher the effective transfer of energy will be lost
2. Foam cutting pads tend to be much’ stiffer’ than wool fibres and thus will transfer the movement of the machine to the paint surface more efficiently than a comparable wool pad on an orbital polisher
Click to expand...

I've read this before... I found it here by Todd Helme?

purple foamed wool pad vs Surbuf pads.. - Corvette Forum


Let's give due credit where credit is due. Todd did a great job of explaining why you can't get good results using long fiber wool pads on DA Polishers.


:bigups
 
Spawne32 said:
compound a car after cutting it with 2000 grit? If so...what pad would you use? wool, or foam.
Click to expand...


Here's a recent article I wrote based upon actually doing the thing I typed about. :D

Removing Orange Peel & Sanding Marks with the Griot's ROP and the Wolfgang Twins

Sanding marks can be removed using a DA Polisher but it's going to be harder with the model you have as it doesn't have the power to keep the pad ROTATING like all the new 2nd generation polisher have.

The new PC 7424XP, Meguiar's G110v2 and the Griot's Garage ROP all are dramatically better at keeping a pad rotating than the first generation DA Polishers and its' only when the pad is rotating on the surface that it is effectively removing paint.

Removing sanding marks means removing paint.

Your best bet would be with the smallest, flattest cutting pads you can get. 5.5 and even 4.0" spot repair pads are pretty easy to keep rotating.

Also, get an aggressive compound like the M105 and only work small sections at a time.

If you haven't read these articles, the go over in detail how to use a PC


Tips and Techniques for using the PC 7424XP Dual Action Polisher to remove Below Surface Defects


How To use: G110 - G220 - G100 - PC/Porter Cable - UDM
If you're moving up to machine polishing, be sure to read the below thread before starting...
Tips & Techniques for using the G110, G100, G220 and the PC Dual Action Polisher
(These are all similar tools)


Both articles were written by myself, the one on Autogeek is a re-write of my original article on MOL


:)
 
wait wait hold on now, what do you mean new generation, i bought the porter cable 7424XP off your website all but 2 weeks ago lol
 
Spawne32 said:
wait wait hold on now, what do you mean new generation, i bought the porter cable 7424XP off your website all but 2 weeks ago lol
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Then you have the new or 2nd generation Porter Cable Polisher.

If you look at the title you typed for your subject, you only typed 7424, not 7424XP

So my reference was in the context of the information you provided. I can't count how many people I interact with that have 7424 and 7336 models and I usually don't find out until I ask them directly because they don't include specific information in their writing.

Words mean things... and lack of words mean things too...

You will be able to remove sanding marks using a PC 7424XP but the right tool for the job is a rotary buffer.

One man's ceiling is another man's floor, what I mean by this is when removing sanding marks there's a difference between making the surface shiny and removing ALL the sanding marks.

Just a little buffing will restore a shine to the surface and some people may accept this. I'm usually held to much higher standards such as 100% defect removal. When aiming for 100% defect removal then for removing sanding marks, the best tool for the job is a rotary buffer.

Read through the links I've provided because in them you'll find the head knowledge you'll need to get the maximum performance from your PC as far as techniques goes, you will need an aggressive foam cutting pad and an aggressive compound.

:)
 
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