I was wondering what's the best way to approach these, using touch-up paint, Quixx , or other.

Ones on the back bumper are numrous in one spotI think caused by rubbing plastic trash can in garage against it. They appear white and thin.

2 single ones on front bumper I did yesterday by bumping something in garage again[:@], however these show black underneath and are wider.
Thanks

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here is the rule of thumb, if you can see the primer us a touch up pen then use the quixx (so the quixx is only for everything over the primer even the last layer of paint) hope this helps at all

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2000 s4

ok yea thanks.

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primer is white?

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Black on Black 1998 Audi A4 2.8LQM
Magnaflow Exhaust 14816 w/ no Res.
Spectre Intake - K&N Filter - Custom Shield
AWE RS4 Grill
RS4 Bumper
.5L Windsheild Wiper Tank
Sony Deck w/ Ipod

PES G2 Fund = $1000/$3500

yeah ish, or grayish

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2000 s4