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Old 09-18-2010, 10:19 AM
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clearcoat timing

PPG tech. publications say basecoats must be clearcoated within 24 hours. If longer the basecoat must be scuffed and recoated. My trim/striping scheme is multi colored and it simply is not possible for me to complete all of the basecoating within the 24 hour window. It will take 5-7 days for me to complete. The question is, if I scuff all the various clearcoat colors that have been applied up to a week before, and then clearcoat, what bad things could happen, if any.

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Old 09-18-2010, 10:51 AM
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I don't know but consider covering your base with 1 reduced
coat of clear then the next day you can lightly scuff
and do your next color combination.
You can also just spray a coat of intercoat clear over the
color to hold it inbetween sessions.

Sanding basecoat is never a good idea.
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Old 09-18-2010, 03:08 PM
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Don't sand the B/C !!!!!!
Use an intercoat clear between your layouts, then clear
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Old 09-18-2010, 04:24 PM
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How long with that extend your time?
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Old 09-18-2010, 07:00 PM
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If the intercoat is activated (as it should be) then the non-sanding window is not extended by much, but the intercoat can be sanded without harm or disruption of the metallic, unlike many basecoats.

Actually, this may depend on the brand of intercoat used, might want to check with the maker.
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Old 09-18-2010, 08:23 PM
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Ahhh ok so say if your doing a three color job, you have the first two colors done and shoot a coat of activated intercoat clear, you can go back two days later and just scuff the intercoat and shoot your third color??
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Old 09-19-2010, 07:11 AM
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Yes. and the new paint will lay real nice over the intercoat.
That's how most graphics guys do it.
They prefer useing intercoat instead of regular clear because intercoat
has less film build.
I use the regular clear because I already have it, if you reduce it
down it lowers the film build and works just as well.
Just be sure to use fine grits when sanding it,
you don't want to break through.
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Old 09-19-2010, 07:10 PM
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Fine grits as in 800 to 1000? And what exactly is the difference between an intercoat clean and clear basecoat?
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