Cut and Buff Plans

Discuss anything after that final masking comes off.



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PostPosted: Wed May 29, 2019 8:01 pm
How long after laying S-P-I Universal should I wait to cut and buff? I shot the body on Sunday and the fenders on Tuesday. I was planning to start cutting in a couple weeks. Is that an appropriate time frame?

I put four coats of Universal on, but I think I did it too lightly. I think I have a mix of both orange peel and dry spray depending on the area... and some dust nibs. I was probably moving a little too fast (afraid of runs) and didn't overlap my passes by 50%.. It was more like an overlap of 20% or even a little less in some places. So perhaps my four coats is more like 2 coats. The car has pretty heavy orange peel throughout. I was using my Devilbiss 670 Plus gun with a 1.4 tip and 40 PSI at the gun.

Here is what I was planning on doing:
- Cut with 1500 using 3M No. 20 Wet-or-Dry sponge pad
- Sand with 2000 using 3M No. 20 Wet-or-Dry sponge pad
- Polish with Meguiars 100 and "medium-heavy" cutting pad on rotary polisher
- Polish with Meguairs 205 and "light-medium" polishing pad on rotary polisher

Does that sound about right? Should I start cutting with a heavier grit? I also have a Hutchins 4500 DA sander that I could use.


Thanks,
Sal

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PostPosted: Thu May 30, 2019 9:16 am
If you have 4 coats on there you should be able to cut and buff it flat.

You need to wait at least 24 hours and time in the sun helps speed things up a bit. After that UV tends to buff really well which is why it is nice as a show car clear.

Personally with heavy orange peel, I would start with 1000 grit on a hard block.
Work a 12" x 12" area at a time and get the surface flat.
From there you can use your 1500 sponge pad followed by the 2000.

Megs M-100 is great stuff but I would recommend a twisted wool pad and rotary buffer. When you finish with that your surface should already look real nice.

Go over that with your M-250 and a polishing or very light cutting pad.

For pics go to this thread on page 11: viewtopic.php?f=12&t=22145&start=100
1968 Coronet R/T


ACTS 16:31

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PostPosted: Fri May 31, 2019 1:11 am
If you want to reduce peel and surface dryness then those sponge pads aren't going to work. You'll need a firm block to get the flatness you want.
Chris



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PostPosted: Fri May 31, 2019 6:28 am
i used UC on a 96 silverado about 8 years ago. 3 coats with that 2 being medium/heavy. a day later put in the sun for the day. next day wet sanded- using hard blocks and starting at 1000 grit then to 1500 and 2000- then put it in the sun for about a half day. then cut and buff.
you can wait as long as you want with UC to cut and buff
if you arent sure about film thickness, i say wet sand with 1000 and spray another 2 coats.

i second what coronet said about the m100 and twisted wool pad. you might not even want to use the m205 after. ya might want to tape off a spot,hit it with the 205, and see if ya notice a difference. the m100 rocks!

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