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Re: shooting clear over black primer
Posted by: Geardo ()
Date: July 21, 2009 04:56AM

Andrew Wrote:
-------------------------------------------------------
> It's not the ideal situation to spray clear over
> old paint but I agree with streblerm. When a body
> shop repairs only one panel they have to blend the
> paint onto the adjacent panels. If you don't then
> the color rarely matches at the edge. This means
> the color basecoat is "faded" from the edge
> nearest the repair out to nothing. The the whole
> panel is scuffed beforehand with a scotchbrite or
> fine wet sandpaper and then clear is sprayed over
> the whole panel to bring the shine back. This is
> pretty much the standard operating procedure for
> the whole industry. If the clear woudln't adhere
> to old scuffed paint then all repairs would fail
> over time....and they don't all fail. Some of
> them do however and that's usually from using
> cheap materials or a lack of prep. Mechanical
> adhesion from scuffing properly is the key.
>
> Here's a very helpful link about the John Deere
> paint.
>
> [www.crankshaftcoalition.com]
> _Blitz_Black_paint


Every car I've seen that was repaired like this, the clear coat started to peal, sometimes it takes a few years, but it will peel off, it's 100% certain!

64 Cessna 150
65 Corsa Vert 140hp 4sp
87 Corvette Z-52 coupe auto
92 SAAB 900S vert 5sp
01 SAAB 9-3 SE turbo vert auto

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Re: shooting clear over black primer
Posted by: streblerm ()
Date: July 21, 2009 05:17AM

> Geardo Wrote
>
> Every car I've seen that was repaired like this,
> the clear coat started to peal, sometimes it takes
> a few years, but it will peel off, it's 100%
> certain!


You are 100% wrong. Clear, primer, or basecoat will all stick to properly cleaned and abraded OEM finishes or good quality re-repairs. If what you are saying were true, than no repairs could be made over old finishes. Clearing over properly prepared oem finishes is a warrantied procedure from every major paint manufacturer. Furthermore, this is the industry standard repair. When done properly, this makes an invisible repair.

If you can see the repair, it wasn't done properly. Peeling paint comes from poor preparation, poor mixing, or not putting the correct amount of clear on the panel.

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Re: shooting clear over black primer
Posted by: patpaldino ()
Date: July 21, 2009 05:51AM

It could be that the old clear was not scuffed properly enough. I always use 600 grit wet to prep the substrate for clear. I make sure the clear has all the gloss gone, especially around any edges. These are where the clear would lose adhesion over time and then afterewards would cause lifting, which once it starts in an area can just keep spreading eventually...

'65 vert ~ Worcester, MA

SOLD!

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Re: shooting clear over black primer
Posted by: 4carbcorvair ()
Date: July 21, 2009 06:00AM

streblerm Wrote:
-------------------------------------------------------
> > Geardo Wrote
> >
> > Every car I've seen that was repaired like
> this,
> > the clear coat started to peal, sometimes it
> takes
> > a few years, but it will peel off, it's 100%
> > certain!
>
>
> You are 100% wrong. Clear, primer, or basecoat
> will all stick to properly cleaned and abraded OEM
> finishes or good quality re-repairs. If what you
> are saying were true, than no repairs could be
> made over old finishes. Clearing over properly
> prepared oem finishes is a warrantied procedure
> from every major paint manufacturer. Furthermore,
> this is the industry standard repair. When done
> properly, this makes an invisible repair.
>
> If you can see the repair, it wasn't done
> properly. Peeling paint comes from poor
> preparation, poor mixing, or not putting the
> correct amount of clear on the panel.


Yup. Next vehicle you see with clear flaking off, take a look at where it is coming off. 99% of the time it will be shiny under it. Which means whoever did the work did not sand/prep that area properly.

Martin Senour has flattening agent you can add to the clear for desired flatness/satin look. Add the apropriate amount to get the look you want. We used it many times. Jeep actually did this for one or two years on production Jeeps in a green color. It was a base clear, only flat. Trying for the OD (Olive Drab) look.

--------------------------------
Ronnie
Southern Maine.
www.dirigocorvairs.net
66 Corsa Convertible, 140, 4sp.
65 Monza Convertible, 110, PG.




It doesn't leak, it's marking it's territory.

A mirror is a reflection of the miles travelled.

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