[SEL] RE: Paint and primer

mullt at att.net mullt at att.net
Fri Jul 15 12:07:47 PDT 2005


Sooo....if you are like me and you screw the paint job up when you are spraying it on, the only way to fix the screw up is to sand blast it off and start over.

Tom in St. Louis
 -------------- Original message ----------------------
From: Curt <curt at imc-group.com>
> Andy Glines wrote:
> 
> >>
> >> I have heard that clear shellac can be used as an inexpensive sealer 
> >> before painting. Any body had any experience with that?
> >
> >
> > That depends on the kind of paint that you will be putting on top of 
> > it.  The PPG Delstar that I use would probably lift if applied over a 
> > shellac.  I suspect that the popular Dupont Imron will have the same 
> > problem.  Just follow the directions that come with the paint.  Makers 
> > like Dupont and PPG have very thorough instructions that tell you what 
> > you can & can't paint over.  In general, the more expensive the paint 
> > the more particular it is about the surface it will be applied to.  
> > You do not have to use very expensive epoxy primers to get good 
> > results for your top coat.  I typically use a rather generic lower 
> > cost gray primer on my stuff.  Available a automotive paint and supply 
> > stores.  I also use the cheap lacquer thinner for the primer and for 
> > clean up.
> 
> Andy,
> Like the shellac, any solvent based primer is going to lift even under 
> the best 2 part top coats if a solvent like gasoline spends much time on 
> the paint. For years I used lacquer based primer surfacers on both 
> automotive finishes and engines. These were top coated with Dupont 
> Imron. This combination works fine on automobile finishes because you 
> rarely have scratches/chips combined with the presence of gasoline. On 
> engines it is a different story. This is why I have finally made the 
> switch to 2 part primers. This way the primer is as inert to the 
> gasoline as is the top coat. Nothing other than sand blasting will lift 
> the paint on an engine/tractor painted with 2 part primer and then 2 
> part color coat.
> Curt Holland
> Gastonia, NC
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