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Unread 04-12-2010, 08:01 AM   #1
rompinthewoods
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How far down do I sand?

I'm sanding my YJ down this week getting ready for paint and it got me thinking. How far down do I sand it? Do I go down to bare metal, primer, or just scuff it up? I'm painting it desert sand. My thoughts were that I need to sand it down to the primer. Is this correct?

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Unread 04-12-2010, 11:23 AM   #2
CJ7-Tim
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Use 220 grit and sand the color coat until all the shine is gone. Pick a direction of sanding and be consistent. For example front to rear, or side to side. Don't sand in circles or criss/cross your sanding pattern on a single body panel. Sanding down to primer is not needed and would take you about 3 solid days of work.
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Unread 04-12-2010, 11:40 AM   #3
shadowulf
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^^^^^what they said ^^^^^

220-320 grit is what I've used on several paint jobs to scuff the original finish to take on more paint. As long as the original paint is not flaking or peeling off, it will work as the"primer" for your color.
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Unread 04-12-2010, 12:42 PM   #4
rompinthewoods
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OK. Thanks. I started to sand to the primer. This should save me some time.
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Unread 04-12-2010, 09:52 PM   #5
Fishtank
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Quote:
Originally Posted by CJ7-Tim View Post
Use 220 grit and sand the color coat until all the shine is gone. Pick a direction of sanding and be consistent. For example front to rear, or side to side. Don't sand in circles or criss/cross your sanding pattern on a single body panel. Sanding down to primer is not needed and would take you about 3 solid days of work.
Just curious, why not sand in a criss-cross pattern?

A random-orbital sander sands in circles, I use it everyday painting cars in my shop. I block sand in a criss-cross pattern to get straight panels on restorations. A sealer would be good advice also when painting over old paint. Keeps bleed-throughs to a minimum.

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Unread 04-12-2010, 10:58 PM   #6
shadowulf
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The "old timer" that I learned from insisted on following the lines of the car/truck when getting ready for paint and when blocking out repairs. I remember some painters did not like crosshatch pattern because sanding marks would "show through". Personally, I thought it was bad prep and poor technique that caused that.

Are you doing the paint yourself?
If so, how are you planning on painting it?
just curious.
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Unread 04-13-2010, 03:22 AM   #7
CJ7-Tim
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Random orbital sanders give a random finish, not a criss/cross patterns which can show through the color coat. If you use to much pressure or too heavy a grit, even random orbital sanding strokes will show through the color coat. For a simple preparation and a basic color coat, sanding in straight lines is best.

If the OP was intending on a professional quality paint job, multiple sanding and priming sessions with increasingly softer grit papers would be called for. Maybe you can give him a deal on the DVD.
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