what grit should I use to re-basecoat?

What brand of basecoat is it? Some basecoats like Dupont's Chromabase have exhibited adhesion problems when sanded, and might do better with complete removal. Most can be sanded with P600-800 and re-based with no problems.

crashtech said:

What brand of basecoat is it? Some basecoats like Dupont's Chromabase have exhibited adhesion problems when sanded, and might do better with complete removal. Most can be sanded with P600-800 and re-based with no problems.

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I Used Dupont ChromaBase..So like you said, I should sand it all down and re spray it? Do I need to prime it again?

thanks

Hopefully someone who uses a lot of Chromabase will chime in here. From what I have seen, it might be best to sand it off or even just wipe it off with reducer.

BUT, I am not an authority on this. Check out this thread and decide for yourself:

http://www.hotrodders.com/forum/int...gainst-data-sheets-recommendation-110339.html

hey i've been using dupont for 11yrs. if you can scuff the bumper down without breaking through you should be alright. did you activate the base? if you break though the base put on some 2540 epoxy sealer(they have 2510-2570 all depending on what value shade you need) mist it on so that it doesn't attack the edge of the base coat. if it lifts it's ok let the sealer dry for an hour and wet sand the spots out with 1000 or 1200. dont break through the sealer. after that base it out and you should be fine. let me know how you make out hope i helped.

I don't know if you really have to do this but DuPont Chromabase
clearly states if you let it go more than 24 hrs without clearing,
it must be removed completely. Seems drastic, but that's what they
say. imp:

203bronco89 said:

hey i've been using dupont for 11yrs. if you can scuff the bumper down without breaking through you should be alright. did you activate the base? if you break though the base put on some 2540 epoxy sealer(they have 2510-2570 all depending on what value shade you need) mist it on so that it doesn't attack the edge of the base coat. if it lifts it's ok let the sealer dry for an hour and wet sand the spots out with 1000 or 1200. dont break through the sealer. after that base it out and you should be fine. let me know how you make out hope i helped.

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what should I scruff it with (the scott brite pad)? Can I sand it down with 220 wetsand? then apply sealer then basecoat it?

jcclark said:

I don't know if you really have to do this but DuPont Chromabase
clearly states if you let it go more than 24 hrs without clearing,
it must be removed completely. Seems drastic, but that's what they
say. imp:

Click to expand...

So I have to sand it all off....then re-apply epoxy sealer and basecoat it again?

I have heard people have sanded the basecoat and rebased then cleared
and not had a problem. So I don't know.
If you sand it all of you may not need to re-prime.
Unless you sand it with a coarser grit than 400, then you'll need the primer
to fill the scratches.
If you could get it all off with 400 (600 is better) without breaking through
the primer then you could just spray more base and continue.
Any break-throughs could be re-primed but I don't think you need to
seal or prime the entire car again.
If you want to risk it, and many have, sand it all with 600 then rebase
and continue. imp: