Pressure using PC 7424 and Megs 105

NetBoy · 10-27-09, 01:04

Using Megs 105 and LC 5" orange pad for lots of swirls on Jet Black BMW (2008).

I saw a video that said to put enough pressure on the PC so it almost stops spinning. Tried this on one door, speed 5, and it removed 80% of the swirls. I'm happpy with this but I can see faint halograms, same size as the pad.
Is this normal?

Should I use less pressure and/or a different pad ?

What can I use next to remove the stuff left behind?

Thanks

wagonproject · 10-27-09, 01:14

I generally use less pressure on the last few passes. And you can use 205 after the 105 to remove whats left behind.

Street5927 · 10-27-09, 01:18

I usually start out on speed 3 or 4, light pressure to spread, then I will apply pressure (not to the point that it almost stops spinning, but a significant amount of pressure) while on 6 for a few passes and then I will lighten the pressure and then back off to speed 3 or 4, and have not had any issues with hologramming.

Passrat · 10-27-09, 02:00

I read to put the polisher on a scale and learn to put 20lbs of pressure on it for polishing, but then I saw a video that said to just use the weight of the machine... So I'm stumped. I'm in basically the same boat as the OP, I'm just starting out with my first machine.

NetBoy · 10-27-09, 02:12

Quote:

Originally Posted by Passrat

I read to put the polisher on a scale and learn to put 20lbs of pressure on it for polishing, but then I saw a video that said to just use the weight of the machine... So I'm stumped. I'm in basically the same boat as the OP, I'm just starting out with my first machine.

I tried the weight of the PC, very light pressure and didn't get anywhere with the swirls.

I'll try another door tonight.

I tried Pinnacle Swirl remover, Menzerna IP. Megs 105 was the only one that removed most of the swirls. My car only has 10k miles but previous owner drove on dirt roads so lower sides have 10x the swirls as rest of the car.

Passrat · 10-27-09, 10:18

I did my first polishing the other day, just the hood of a 2 y.o. altima that had faint scratches like spiderwebs, very minor swirls and faint holograms from a so called "pro" who did the car once. I used Menzerna micro polish with a CCM white pad with the 20lbs (maybe more) pressure method and worked the polish for like 6-7 minutes each section at 4.5-5. When I was done the holograms and swirls were like 90% gone and only the webs were left easily visible. It was really shiny too.

I'm planning on practicing some more and then I'm all set up to Sonus clay, Menzerna IP, Menzerna Micro, then probably Megs #7 and last WDG3.0. But probably not till spring since I have a ton of Klasse SG on the car now.

Accumulator · 10-28-09, 09:25

I've never worked on it, but I hear the BMW Jet Black paint uses especially soft clear, so I'm not surprised that M105 hazed it.

If you inspect with the right lighting/conditions, you'll find that M105 micromars most *every* paint, even really hard ones. That's why the made M205 to be used as the subsequent step.

When working by PC, I apply as much pressure as I can without bogging the machine/stopping the rotation...well, maybe not *quite* as much as I can get away with when using 4" pads, but I do apply plenty.

"Let the product do the work; use just the weight of the machine" sounds super, but it just doesn't work for me when I'm trying to do serious correction. No, not even with M105...at least not unless I'm using the Flex on fairly soft paint. *IMO*, a lot of that super-conservative advice is merely CYAing by vendors who don't want people pointing fingers after they botch up their cars by overdoing things.

Darkstar752 · 10-28-09, 09:43

eShine Canada- Proper Buffing Pad Care

Plus, you need to foloow up the 105 with something like 205.

NetBoy · 10-28-09, 12:04

I tried another door panel last night. I had to apply enough pressure where the PC slowed just a little.

I think my problem is I'm using older LC 5 1/2 pads. I just got some new LC 6" pads and they are much firmer than my old pads.

I don't have Megs 205 yet so I used Menzerna FPII on a LC white 5 1/2" pad and that removed most of the hazing/halograms.

Overall I'm happy with the results. A few swirls are visible in direct sunlight but this is much better than before. I have Zaino Z5 Pro and Ps21 to cover up what's left.

Accumulator · 10-28-09, 01:14

Quote:

Originally Posted by NetBoy

..I think my problem is I'm using older LC 5 1/2 pads..

Heh heh, one might argue that the problem is that you're using pads larger than 4" via PC

the_invisible · 10-28-09, 02:34

Inducing light hazes or holograms is normal for M105 and an orange cutting pad. If the job doesn't require an orange pad, you could use a white polishing pad. I haven't worked on the jet black BMW, but my metallic black 335i paint is so hard that M105 and an orange pad was essentially useless. I had to use a wool pad for the job.

From my experience, the LC orange pad could withstand high pressure without bogging down the DA.

gmblack3a · 10-29-09, 05:51

Draw a line on your BP where you can see it while it spins. For heavy defects the pad should spin CW slowly. Notice that when not on a flat surface the pad will stop spinning very easy. So adjust your pressure.

Also keep the pad very clean, brush it off and then use compressed air to remove the dust from the pad.

Don't forget to prime the entire face of the pad before you start.