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What I see causing most problems with primer is exposure to the elements.
People will spray primer over body work or bare metal and then leave it
for several months or years. Most primers that are meant to be sanded are
porous and water will pass right through to the steel. If the car is
allowed to sit outside, the primer can do nothing to stop rust from
forming. In fact, quite often you won't even see the rust until you
shelled out a bunch of your hard-earned money for that "killer" paint
job. Primer will also oxidize when it is allowed to sit for any length of
time. If the odxidized layer isn't sanded off before paint is applied,
peeling will be the result.
There are primers, such as PPG's DP series epoxy primers that seal out
moisture and have corrosion resistant qualities. This product can
actually be left uncoated for a great length of time. Sometimes I hear
people say it's too expensive. I used to paint for a living. I don't like
to do things over. If I have to spend a little more up front to prevent
myself from having to do something a second time, it was well worth it.
If you are doing a job that can't be painted any time soon, use an epoxy
primer. I recommend using an epoxy first anyway. It's good insurance. I
put it on before I use any body filler. Body filler sticks to it better
than it does to steel. Then, when you are ready for paint you can spray a
surfacer type primer over your work to finish it. I would recommend a 2
part primer over any air dry lacquer type primer. The 2 part products
fill much better than the old stuff and they are much less prone to
shrinking also.
Bill Vander Werf
Chris Marsh wrote:
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>
> I was talking to a guy and he said that he used gray primer on a car
> that he had restored and about a year after he had gotten his new
> paint job it started to peel. He said that it was unstoppable and
> the primer was the reason for the peeling. Do you guys have an
> opinion on this? He said that it was a little while ago and they may
> have fixed the problem. Any ways I've never heard of this so your
> opinion is valued by this guy.
>
> Chris
>
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