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Old 09-19-2012, 08:25 PM
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base coat clear coat question.

Im in the middle of paint and cause of unforseen reasons ,I cant start the top coats till later.I was wondering basically how long I have after the base coat is shot before I have to sand or any other work.Im talking only like over nite.Ive never been held up like this so I dont want to waste the job.Thanx for any advice.If it helps,I laid a black base to cove with clear with a real fine flake to finish.

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Old 09-19-2012, 09:11 PM
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What kind of paint? What does your PDS (Product Data Sheet) say?

Brian
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Old 09-19-2012, 09:45 PM
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The data sheets dont say much at all.Im usng the martin senor paint,or crossfire usually stocked by napa.All it mentions mixing and repeat coats at flash time.But nothing about cure time or top coat time.I was actually hoping the humidity here will slow down dry time and not have to much effect,Ya know,long as it has a little tack to it.
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Old 09-20-2012, 12:26 AM
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What are you talking about it clearly says 7 days after base to clear.

"RECOAT
Allow 5 minutes flash time between coats.
Allow to flash 15-20 minutes @ 75 F before clearcoating.
If not clearcoated in 7 days, scuff sand basecoat and reapply basecoat color before clearcoating".


I don't know which one you are shooting but all three say the same thing. And notice it says "scuff sand" the base before clear, don't sand it flat, just scuff it.


http://www.martinsenour-autopaint.co...glish/9487.pdf

http://www.martinsenour-autopaint.co...ish/MA4638.pdf

http://www.martinsenour-autopaint.co...ish/MA5211.pdf

Brian
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Old 09-20-2012, 10:14 AM
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thanx alot Brian...
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Old 09-20-2012, 08:46 PM
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Most stuff can be found in the tech sheets. I know some times they can be confusing or not have the answer for something you need. So don't hesitate to ask here, there are no stupid questions.

Brian
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Old 10-03-2012, 11:12 PM
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For sure, the only stupid question is the one you didnt ask. And I would scuff after 24hrs just for precaution, I use Ppg and we have a 24hr window
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Old 10-19-2012, 06:27 AM
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Quote:
Originally Posted by paint dude View Post
For sure, the only stupid question is the one you didnt ask. And I would scuff after 24hrs just for precaution, I use Ppg and we have a 24hr window
Scuff base coat ?
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Old 10-19-2012, 08:51 AM
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Quote:
Originally Posted by paint dude View Post
For sure, the only stupid question is the one you didnt ask. And I would scuff after 24hrs just for precaution, I use Ppg and we have a 24hr window
There is no need to scuff.

Right from the tech sheet........

RECOAT

Allow 5 minutes flash time between coats.

Allow to flash 15-20 minutes before clearcoating.

If not clearcoated in 7 days, scuff sand basecoat and reapply basecoat color before clearcoating.


Brian
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Old 10-20-2012, 10:55 PM
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base coat clear coat question

What is scoff sanding ? What grit to use ? thanks in advance
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Old 10-21-2012, 08:57 AM
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Originally Posted by wayne gillis View Post
What is scoff sanding ? What grit to use ? thanks in advance
Scuff sanding is just a very light sanding to break the surface. It can be accomplished with a light application of a red Scotch Brite pad.

Vince
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Old 10-21-2012, 09:22 AM
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Or a gray pad of course too, it depends on WHAT you are "scuffing".

Brian
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Old 10-21-2012, 10:41 AM
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In every shop I worked at the painters do not like scuffing base and clearing over it. They will rather sand the base good, which will lead to break thrus and then lightly re-base, then clear. Just a thought.
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Old 10-21-2012, 10:45 AM
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You can't really scuff the base and clear over it at all, the clear will magnify the scuffing. If you scuff you MUST apply more base prior to clear.

But FOLLOW THE TECH SHEET! Many bases have warnings IN BOLD PRINT do NOT sand the base! It will clearly say things like "nib" it or "Scuff" it which is NOT "sanding" it flat, that is two totally different things.

Read the tech sheets!

Brian
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Old 10-21-2012, 11:23 AM
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just saying, guys that are actually painters by trade have done it for over 40 years like that.

Last edited by tech69; 10-21-2012 at 11:29 AM.
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