Typically the isocyanates are in the hardener not the base substrate..
dave
On 7/31/2014 10:46 AM, sentenac.rw@gmail.com wrote:
> On Thu, 31 Jul 2014 09:30:20 -0400, you wrote:
>
> I just checked again to be sure. PPG epoxy primers do not have
> isocyanates. Other PPG primers DO but not the epoxy primers. I have
> used PPG epoxy primers over ten years, both the older DP40 and the
> newer stuff. Both are good base coats next to bare metal, and can be
> a seal coat over the (sanded) filling primers. Old PPG primers like
> Kondar are just thinned with laquer thinner and no hardener. But the
> new primer-surfacer stuff is hardened with isocyanates.
>
> The only thing about PPG epoxy primer is that if you don't cover it
> with other primer or top coat within something like a week you have to
> sand and recoat the epoxy before you cover it. But for amateur
> restorers having a very rust resistant coating on metal is worth the
> hassle when it comes time months later to finish the painting job.
>
> -Roland
>
> On Thu, 31 Jul 2014 09:30:20 -0400, you wrote:
>
>> The PPG DP primers are great, but they don't come without risk for the
>> do-it-yourselfer. Like other epoxy paints, they contain isocyanates, which
>> are poisonous. A normal face respirator isn't sufficient protection and
>> they have a cumulative effect that can actually coat the inside of your
>> lungs. I've known a few painters who've had to quit the profession as
>> they've been told further exposure would kill them. The manufactures
>> recommend a full face fresh air supplied respirator as well as full body
>> protection for application. Google "*Questions and Answers About the Safe
>> Use* of.
>> *Isocyanates" to go to the PPG fact sheet. *
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Dave Porter Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM
87107 505-352-1378 Go HERE: my world www.porterbikes.com/
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