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Old 07-14-2008, 12:04 PM
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ppg dcc 9300 final sand grit?

product sheet says 400-600
I sprayed dp epoxy then 4 coats of k38
then blocked with 80 and 180
then spayed 3 more coats and blocked with 180
sprayed 4 more coats on Saturday (a whole gallon)
and think I am going to block once more with 320
is 320 enough or should I hand sand the 320 scratches with 600 after the final blocking.
I am going to spray a coat od dp as a sealer before the dcc.
Thanks for any help
p.s. this is a LOT of work

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Old 07-14-2008, 12:05 PM
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and......
do I need to wet sand or will dry be fine
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Old 07-14-2008, 01:14 PM
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One more thing....
Aftrer all my blocking I really dont want to screw it up by hand sanding.
is using a stiff pad good enough to keep my blocking straight?
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Old 07-15-2008, 06:34 AM
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I think you're shooting a singlestage urethane dcc9300? Is this Concept black if I remember correctly? If you're shooting a coat of DP as a sealer then 320 dry should be fine enough, a good rubdown after the sanding with a grey scotchbrite will also help. If you're after perfection you may also want to shoot three coats of color then block it with 600 wet and shoot a couple more flow coats.
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Old 07-15-2008, 12:17 PM
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Yes concept black single stage urethane.
I started blocking with 320 last night and still broke through to metal in 2 places so far, but just barely.
Bare metal spots are small (like smaller than a quarter).
Can I just spray the sealer (reduced dp) over these tiny break throughs? Or am I going to need to spray high fill and block again?

I wet sanded to 600 also.
I was unsure of 600 and dp holding?
If Dp will grip 600 then I would rather not risk sand scratches ruining my hours upon hours of blocking.
Thanks
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Old 07-15-2008, 12:23 PM
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Yes, the dp will adhere fine to surfacer sanded at 600. And for quarter sized and smaller sandthroughs I would definately just seal with DP and go to paint.
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