| Re: [GMCnet] paint sticking problem ??? [message #163810 is a reply to message #163808] |
Thu, 22 March 2012 00:49   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Steve, there are two adhesion considerations when applying paint. One is
chemical ( the compatability between the various primers, solvents, top
coats etc.) and the other is mechanical. How smooth the surface of the
underlying coating is when applying the next subsequent coating. If you
allowed the etching primer to set for several days, and did not scuff the
surface with fine scotchbrite or 400 grit paper followed by thorough
chemical cleaning with the correct stuff, adhesion is adversely affected.
Try to tell if the coatings are separating from the metal frames, or
between layers of materials. If there was any silicone sealer in the area
of the windows, or silicone containing waxes or polishes, that could be a
cause. There are prep solvents that help to minimize the effects of
silicone. I hate it when that kind of stuff rears it's ugly head, it really
messes with my attitude regarding trying to do the best job possible.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Wed, Mar 21, 2012 at 10:15 PM, steve & debbie <zzdebz@yahoo.com> wrote:
>
>
> Hello all,
>
> I am having a problem with spraying the toll windows..
> I cleaned the windows to bare metal, and then used a thinner to wipe any
> grease off the metal frame parts. Next using an etching primer allowing to
> dry for several days. Lastly using a black enamel spray. Leaving to dry for
> several days, i find i can easily scratch the paint right off !!!!. I have
> spent hours stripping the old paint off, cleaning, etc and i am getting
> nowhere on this. HELP why is this happening. The paint i am using is
> indicated to be correct for the task, for use on alum metalwork. The top
> coat is also correct for the undercoat. The undercoat is sticking with no
> problem. Once the black enamel is applied it seems to come off a little too
> easy, along with the black top layer ????
>
> cheers and beers
> --
> Steve & Debbie
> Monticello, FL
> 77 Palm Beach :- Aurora
> EX G4WDT
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