Easier to cut and buff right after paint or way after?

Discuss anything after that final masking comes off.
How soon do you cut and buff?

The very next day.
6
40%
1 week after.
8
53%
2 weeks after.
1
7%
2-3 months after.
0
No votes
 
Total votes : 15


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PostPosted: Tue Jan 19, 2016 11:12 am
Bow tie, the run happens around the final coat.

So since the sourrounding areas were smooth. What should I do next time I sand a run the following day if needed to avoid getting a halo?
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PostPosted: Tue Jan 19, 2016 10:38 pm
I've never personally experienced the issue that you're having. But ensuring that your surface is flat by using a hard block on top of the run should help. The area around the run usually ends up getting sanded much more.

You're not possibly sanding through multiple coats of clear are you around the run causing the halo?
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PostPosted: Wed Jan 20, 2016 9:20 am
Serf, can you post a picture of what you are talking about.
I have lots of experience with runs :whoops: but never saw a halo. My guess is bowtie is right about the sanding scratches. They can be very fine scratches but will deflect the light in such a way as to cause a halo effect.
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PostPosted: Wed Jan 20, 2016 2:14 pm
Thanks for the info bowtie. I think I may have sanded through layers of clear around the run. This was a few weeks ago but want to know for future references... Or runs if I should sand them days following the paint job.

68, these are the best pictures I can get of the run. I don't have close up pictures.
You can see the run outline but the surface was completely flat.
Do you guys think it was due to the sand paper hitting the outter edge of the run more than the run?
I could've bet I sanded it by hand back and forth to get the smooth surface.
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PostPosted: Wed Jan 20, 2016 4:48 pm
Are you sanding it with a soft block or hard block??? Best way I learned was with a razor blade
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PostPosted: Thu Jan 21, 2016 12:17 am
With a soft block.
I also use a razor blade when cutting runs out, but that is when i am cutting and buffing after a week since painting or so.

I guess i got that halo because i was sanding the run out the next day?
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PostPosted: Thu Jan 21, 2016 12:32 am
Serf27 wrote:With a soft block.
I also use a razor blade when cutting runs out, but that is when i am cutting and buffing after a week since painting or so.

I guess i got that halo because i was sanding the run out the next day?


You should never use a soft block on a run unless it's within a body contour, with a soft block you're going to end up sanding the surrounding area WAY more than the run itself. Something else to take note of when color sanding is how you fold your paper on your block, the face of paper that your sanding with should not have an edge underneath it.

The razor blade method works great for shaving off the highest parts of a run off.

I believe that the halo is either from sanding down to your first coat of clear, or from deeper scratches being the area was sanded significantly more than the surrounding area of the panel.
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PostPosted: Thu Jan 21, 2016 12:59 am
Thanks for the info bowtie, lookslike ill be using a hard block from now on.

Im really going to aim to having now runs though, save the headache!
I think i am going to be cutting and buffing within 2-3 days now of paining.

Hey, what do you or other members suggest on doing when first coat of clear gets a run?
I know my base i can Let it dry for 20-30min then sand it out and re spray the area.
But the clear takes so much longer to dry, should i let the panel dry and sand the run the following day and re clear the panel?
This is for future references.
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PostPosted: Thu Jan 21, 2016 7:30 am
Just lurking in the background, trying to learn from others mishaps.

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PostPosted: Thu Jan 21, 2016 11:20 am
Another trick is to put masking tape over the run and using a hard block to sand the run through the tape. The raised area will sand away to the level of the tape. Then you remove the tape and carefully concentrate on just the run.
Also, you still seem to be getting quite a bit of orange peel. Try upping the pressure on your spray gun or turning your fluid knob in another 1/2 turn.
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