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Old 07-05-2010, 01:57 PM
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Is 320 to 600 too big a jump in grit?

Hi guys!
Finally got my car in the 3rd round of block sanding, did 120 dry twice and moved up to 320 currently.
I was just cruising around online and saw that a lot if not most people recomend 400 grit then 600 before finishing with solid color SS Urethane.
To me 320 and 400 seems like a pretty insignificant change in grit but I'm far from a professional painter. So the question is can I jump from 320 dry to 600 wet and finish with a SS Urethane and be ok?

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Old 07-05-2010, 02:06 PM
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Yes you can go from 320 to 600, myself I would have went to 400 when you went to 320 but now that you are there I would continue with 600.
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Old 07-05-2010, 07:32 PM
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You sanded with 120 than moved up to 320 without priming in between? Right there is too much of a jump for my liking. The coarsest I go if Im not priming after is 220, rarely.

Anywho, I've been told that anything more than 100 grit difference is less than guaranteed to remove the scratches.
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Old 07-05-2010, 08:25 PM
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Yes I agree BMM, but that has to be a typing error, I'm hoping that he ment 220?
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Old 07-06-2010, 06:57 AM
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Yea typing error, I blocked with 120, re-primed, blocked with 120/320 combo, re-primed (3rd time) and now i'm sitting on a fresh coat of primer with guide coat. The plan (currently) is to use the 320 to knock down some of the orange peel then jump to 600 for final prep.

Last edited by 69ChevelleAddict; 07-06-2010 at 07:17 AM.
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